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Working with multibib, Bibtex started failing me after a recent reinstallation of texlive on xubuntu. On
bibtex <project-path>/src.aux
I got:

To get rid of the error, open texmf.cnf, which resides in /usr/share/texlive/texmf/web2c through
sudo gedit /usr/share/texlive/texmf/web2c/texmf.cnf
Then find the entry...   READ MORE

I have not needed it so far, but I’m sure the day will come where someone insits, so this howto might come in handy: http://ubuntuforums.org/showthread.php?t=1033441

Strikethough in LaTeX using »ulem«

\usepackage{ulem} in the preamble gives you two ways to strike out text (and a couple more for underlining):

1. \sout{text to be striked out} for a horizontal line through text to be striked out (exactly like »line through«).
2. \xout{text to be crossed out} for many short diagonal lines crossing out the letters of the text to be crossed out

The problem that ulem affects some bibliography styles where otherwise italicised text is then underlined can be remedied through the »normalem«-option in the preamble: \usepackage[normalem]{ulem} (Thanks Fredrik!).

Ulem is part of MiKTeX and TeX Live but also available at ctan.

Strikethrough in LaTeX using »cancel«

\usepackage{cancel} in the preamble gives you four different modes of striking through

1. \cancel{text to cancel} draws a diagonal line (slash) through its argument
2. \bcancel{text to cancel} uses the negative slope (a backslash)
3. \xcancel{text to cancel} draws an X (actually \cancel plus \bcancel)
4. \cancelto{〈value〉}{〈expression〉} draws a diagonal arrow through the 〈expression〉pointing to the 〈value〉 (math-mode only)

You can get cancel at ctan.

Results

Click on the image for pdf or download the source file – which looks like this:

\documentclass[a4paper,11pt]{article}

\usepackage[utf8]{inputenc}

\usepackage{setspace}

\usepackage{ulem}

\usepackage{cancel}

\begin{document}

\sffamily

\doublespace

\textbf{Ulem:}

\verb+\sout{striked out text}+ renders \sout{striked out text}

\verb+\xout{crossed out text}+ renders \xout{crossed out text}

\textbf{Cancel:}

\verb+\cancel{canceled text}+ renders \cancel{canceled text}

\verb+\bcancel{b-canceled text}+ renders \bcancel{b-canceled text}

\verb+\xcancel{x-canceled text}+ renders \xcancel{x-canceled text}

\verb+\cancelto{<value>}{<expression>}+ renders $\cancelto{value}{expression} $

Cancelto also works with more complicated expressions:

\verb+\cancelto{\frac{num2}{den2}}{\frac{num1}{den1}}+ renders $\cancelto{\frac{num2}{den2}}{\frac{num1}{den1}} $

\end{document}

\usepackage{palatino}
\usepackage{times}
\usepackage{bookman}
\usepackage{newcent}

or, for standard post script fonts

\usepackage{pslatex} or
\usepackage{ae,aecompl}...   READ MORE

In the preamble

\usepackage{textpos}

In the document
\begin{textblock}{2}[0,0](8,1.5)
    Lorem ipsum dolor sit amet
\end{textblock}
The arguments are as follows:

\begin{textpos}
{<width>}
[<left handle>,<top handle>]
(<leftmargin>,<topmargin>)...   READ MORE

I wanted to have footnotes from inside sections, subsections, and subsubsections. They work similar to footnotes in tables, you need to address them similar to this:

\section{Some Section in my Document\footnotemark}

\footnotetext{My boring footnotetext.}

Only, when I did it like this, it worked on some occasions, but not on others (reason for me biting the wood).

I finally found out that it did not work on all occasions where I did it exactly like in above example, but always rendered

TeX capacity exceeded, sorry [input stack size=5000]
However, it did work on all the occasions where I specified the (optional) short title for section/subsection/&c:

\section[Section in Document]{Some Section in my Document\footnotemark}

\footnotetext{My boring footnotetext.}

The optional shorter title appears — as far as I know — in the table of contents and in left-/rightmark. Also, Kile uses it to display the document structure, too. So if you have rather long titles (like I do) it is a good idea specifying a short one anyway. If not, I guess you can just as well repeat the full title in the optional argument if you need a footnote.

When using the starred variant (\section*{My merry section}), don’t provide a short title.

Create a folder <remreset> in your local package repository. Save the file remreset.sty into this folder.

Open your preamble and add
\usepackage{remreset}
\@removefromreset{footnote}{chapter}
Should you get an error message like this
You can’t use ‘\spacefactor’ in vertical mode. \@
or like this
Command \@ already defined.
embrace the stuff with \makeatletter and \makeatother:
\usepackage{remreset}
\makeatletter
\@removefromreset{footnote}{chapter}
\makeatother
Voilà.

1. $\Gamma\rho\varepsilon\varepsilon\kappa$ gets you Γρεεκ allright, but it looks clumsy and lacks all the accents etc.
2. betababel. It does not work with my customised control sequences, and I am too lazy to change them and learn them all anew.
3. polutonikogreek. Neat, slim, worked straight away.

Nos. 2 & 3 use ngerman, so make sure they don’t start a fight with german.

update

I had a slight problem with polutonikogreek and titletoc. Whenever I used something like
\greek{p’olemos}
which referred to this entry in the preamble:
\newcommand*{\greek}[1]%
   {\selectlanguage{polutonikogreek}{#1}%
   \selectlanguage{german}}
the .toc-file looked like this at the corresponding place:
[…]
\contentsline {section}{\numberline {1.1}KAPITEL-1.1}{14}
\contentsline {subsection}{\numberline {1.1.1}UNTERKAPITEL-1.1.1}{14}
\select@language {polutonikogreek}
\select@language {german}
\select@language {polutonikogreek}
\select@language {german}
\contentsline {subsection}{\numberline {1.1.2}UNTERKAPITEL-1.1.2}{20} […]
Wherever \select@language appeared in the toc, the styling of my toc entries of the subsection level was being messed up. I style subsection entries in the toc in a way that they all get written in a single line. It looks like this:

\titlecontents*{subsection}[3.5em]
   {\vspace{-0.5mm}\itshape\footnotesize}{}%
   {}{\dots\normalfont\footnotesize%
   \thecontentspage.\enspace}%
   [\itshape][\vspace{1mm}]

There are two solutions.

1. Ignore the problem, compile your document, open the .toc-file, delete all \select@language entries and compile again (but only once).
2. Use the following specifications in your preamble:

   \usepackage{ucs}
   \usepackage[utf8x]{inputenc}
   \usepackage[polutonikogreek,german]{babel}
   \newcommand{\gdir}%
      {\foreignlanguage{polutonikogreek}}

   and then put the greek text directly into your document like this:

   \gdir{Πόλεμος}

How it does work:

Here is what we do: We define the counter
\newcounter{MyCounter}
then we add
\renewcommand\theMyCounter{\roman{MyCounter}}
after it, and it works. Thanks to Axel for his help on this.

How it does not work:

When you define a new counter like this
\newcounter{MyCounter}
And later use it like this
\refstepcounter{MyCounter}\label{example}
\roman{MyCounter}. Beispiel eins
And then reference it like this:
And now I reference an example \ref{example}. \end{document}
Then LaTeX still interprets it as something like
\newcommand\theMyCounter{\arabic{MyCounter}}
So it results in an arabic number. This is not what we want. We want to reference the counter in lower roman (or upper roman or alph or what have you), too.

Now, I never liked this date format, so if you, too, prefer DD-MM-YYYY, open timestamp.sty and scroll to the very bottom. Replace

\newcommand{\timestamp}{\the\year-%
\ifnum\month<10 0\fi\the\month-%
\ifnum\day<10 0\fi\the\day\ \xxivtime}
(the last three lines above \endinput) with
\newcommand{\timestamp}{\ifnum\day<10 0\fi\the\day.\,%
\ifnum\month<10 0\fi\the\month.\,%
\the\year\ — \xxivtime\,h}
\timestamp then produces
23. 03. 2007 – 14:34 h
However, the version I use looks like this:
\newcommand{\timestamp}{compiled on \ifnum\day<10 0\fi\the\day.\,%
\ifnum\month<10 0\fi\the\month.\,%
\the\year\ at \xxivtime\,h}
So the output reads
compiled on 23. 03. 2007 at 14:34 h