tubify
This looks quite interesting.
It seems like Tubify searches YouTube and LastFM to create playlists based on which music and music videos others in your area are listening to in semi real-time.
The time-machine feature is particularly quite cute, jump back to '67 or almost any point between then and now for the Billboard US top 100 from that date.
Who remembers the Bay City Rollers actually cracking the US top 20?
With sign in via Facebook or Google getting started is super easy.
Now say goodbye to your afternoon...
