Bryce and I were talking today, and I mentioned all the fun I had reading the "gettext" documentation on the various "special cases" that need attention when coding. He asked me to send in the sections I had noticed, just in case other folks hadn't seen these:
Formatting with re-ordered printf-style elements http://www.gnu.org/software/gettext/manual/html_mono/gettext.html#SEC18
Plural forms beyond just english "one" and "more than one" http://www.gnu.org/software/gettext/manual/html_mono/gettext.html#SEC150
GUI menu contexts http://www.gnu.org/software/gettext/manual/html_mono/gettext.html#SEC151
Since I'm the average one-language-speaking American, I found these three sections very enlightening. They are all probably pretty obvious to anyone trilingual in Polish, German, and English, though. ;)