Online Encyclopedia of Mathematics Edited by Michiel Hazewinkel (CWI, Amsterdam), and originaly published in dead tree form in 2002, now free to browse and poke into. [more inside]
posted by Iosephus on Aug 2, 2008 - 7 comments

More than fifty selected articles from The Princeton Companion of Mathematics (username: Guest, password: PCM) — a thematically-organized compendium of mathematics and mathematicians from Fields Medal-winner Tim Gowers. [via, previously]
posted by Blazecock Pileon on Sep 27, 2007 - 8 comments

The journal Nature: "Wikipedia comes close to Britannica in terms of the accuracy of its science entries."
Nature had experts review articles from both encyclopedias. (Also, 10% of Nature authors contribute to Wikipedia.)
posted by Tlogmer on Dec 14, 2005 - 31 comments

"The gremlin in Falling Hare (who, let us reiterate, is *not* Wendell Willkie) has an elegant flying helmet/plane tail design and a Benny Rubin-like laugh." The Warner Bros. Cartoon Companion covers the heyday of Merrie Melodies and Loony Toons, with capsule biographies of Warner Brothers animators, explanations for no-longer-obvious cultural references, and brief notes on the characters. No design to speak of, but a wonderful resource for anyone searching for a list of WB cartoons that parody Cab Calloway, arguing about whether Elmer Fudd predates Yosemite Sam, or just wondering what the heck Marvin the Martian's given name was.
posted by snarkout on Aug 29, 2001 - 29 comments

WhatIs - Definitions for thousands of the most current IT-related words. Not everyone knows about this site. It is pretty helpful for a quick lookup for anything computer related.
posted by sikander on Jul 11, 2001 - 3 comments