Lollipop Lust Kill - Hard rock, not very well known at all
Nonpoint - Pretty well known, great group imo.
Adema - Again, pretty well known, still a great band.
SR-71 - Quickly gained popularity, good 'almost punk but not quite'
Opeth - Again well known, awesome progressive metal
StereoMud - Great vocals/guitars, not well known.
Ill Nino - Good stuff, metal.
Sorry guys, but I tend to listen to borderline mainstream stuff
//Edit: Finch is another good band. Goddamn my Maxtor for crapping out, else I'd have a whole shitload of bands to list.