Syzygy, a fast-paced multiplayer crossword game. See videos. Really neat idea, makes me wish I had friends.
See also Bananagrams, Take Two!, Pick Two!, Double Quick!. (Thanks to a coworker.)
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
December 7, 2007