Submission + - Numeral Systems of the World's Languages (eva.mpg.de)
labr!nth writes: Linguist Eugene Chan has "successfully collected basic numeral systems and data from about 4,000 languages in the world." He gives a summary of many of these on his website. All sorts of interesting systems are used including various bases (e.g. 2, 3, 4, 5, 10, and 12), body-part tallying, and languages that only distinguish between one and many (c.f. various wikipedia articles on Everett and the Piraha language). The site is ugly and difficult to navigate, but summary boxes at the bottom of specific language pages are informative. Especially interesting are those from indigenous languages from remote areas (c.f. pages for Bella Coola or Kwadi).