I didn't see this video up on Planet GS yet, and I thought it was pretty neat. It's a well-done animation of OSM's evolution during 2008: both pretty to watch and a compelling testament to the power of allowing users to create and meddle with data.
OSM 2008: A Year of Edits.
Unrelated: I've been quiet on the blogging front, but that's because I've been rather busy finishing out some contract work. Expect some updates to Boundary Generator soon!