"Google turned off Code Search earlier this week." Google announced Code Search's impending departure last October (to unhappiness). Russ Cox, one of the original authors of Code Search and one of the head Go engineers (previously and previouslier) has published an explanation of how Code Search worked, and enough code that you can run similar queries on your own machine.
Stackoverflow grapples with the many spellings of "Gaddafi." Thank God programmers are on the case, because everyone else is confused by the 112 possibilities (even with this chart)! Even Dr. Demento weighed in.
Regex Dictionary - for those times when you want a web-based dictionary you can search with regular expressions.
"Text Utilities" is a useful browser-based tool for geeks. It's a web page that does all sorts of operations on text, e.g. escape/ unescape, hashing, regexp testing.