The Flock browser, based on Firefox, foregrounds integrated social bookmarks, shared photos, news aggregation, and blogging. Using Flock is an "immersive, bilateral experience." I call it "cool."
To really learn about the vision behind Flock, listen to Mike Arrington's podcast with the Flock team.
In combination with iJot and Writely, Flock would make a great Personal Learning Environment.
Blogged with Flock
Update: here's a review.
