If you enjoy solving clues, a new LOST ARG has recently surfaced. Recent communications have been received from one "Dr. Matt Konnise" from the Resonant Harmonics Project. The "cascade event" begins Sunday, August 15, 2010, 12:01 a.m. with the first of 15 puzzles over 15 days!
Hop over the The Lost ARG Blog if you want to play as a group. They are nice folks and super sleuths.
This is officially "unofficial" until proven otherwise.