http://pythex.org/ isn't quite a cool as kodos, but it is definitely handy for getting a regular expression correct in python.

That made adding FSR support to libais pretty easy.

Spelling, grammar, and other mistakes in latex or org-mode writing

Sigh.  I just found yet another typo in a published journal paper this evening.  "the there" -> "there" in my 2006 Santa Barbara paper.  I hard started to create scripts to check for these sorts of issues, but it doesn't look like that was good enough.  This one of the few ways that Microsoft Word, Apple Pages and Google docs are better than text based tools.  But nowhere near enough to get me to switch.  I'm not giving up emacs and org-mode for the majority of my writing.