I think this thread is a neat idea, considering there are easily hundreds of bands on MySpace Music and nobody has the time to hunt them all down, so it's nice to see what other people find good for consideration.
Anyways, can't say I've really found many bands. Get Vegas! and Pistolero and Burn Proper are some musical acts I downloaded from MySpace when I found them. Also have a friend, Matt Lawrence, that makes his own electronica music for listening on MySpace Music. Fun stuff.