"Supergroups"

All this Middle Brother talk got me thinking about "supergroups" so I threw in Monsters of Folk this weekend (Losin yo Head - http://www.youtube.com/watch?v=euHj9teuaTo)

Others that come to mind are:

Mad Season (I"m Above - http://www.youtube.com/watch?v=gj0Ul3Sdn64)

Audioslave (Cochise - http://www.youtube.com/watch?v=aasGjnt7uWg)

Also - does Warren Hayes jumping on stage at Bonnarroo count as a super group?