OK, this is getting a bit silly, but here are even more favicons I've come across in the past few weeks. I decided to relax my no-anti-aliasing rules a little because some icons like John Hicks, Andy Budd, and Infrangible were too nice to turn down. Thanks to everyone who gave me recommendations and please keep them coming. Also see the full collection.
It's really nice when you know that a company has a logo that's very conducive to a sweet favicon and it turns out they've done it well. Lots of companies I visited had no favicon or a really bad implementation, but a number had fine examples. Purina, IDEO, Vodafone (their Portugese site), Mountain Equipment Co-op, and Upromise are all very nice.