Capture the Flag with Stuff is one of the wierdest games I've ever seen proposed. Cool.
When I finally learn Chinese, this incredible dictionary of Hanzi (not exactly Kanji) character 'etymologies' will be something I'll consult often.
Cyrillic converter, since nobody likes to use the same standards. It detects automagically which encoding is in use. Nice, huh?
A page on the Latin and Cyrillic orthographies for Belarusian (kirylièny j ³acinski bie³aruski pravapis), which I really should take in so as to plan my latinization of Ukr. better.