Mark Tremonti from Alterbridge is seriously under-rated, people think he sucks just because he was in Creed and had to play all their songs in the key of D just to accomodate Scott Stapp's lack of vocal talent. If you want good Tremonti stuff, check out the Alterbridge album.

Daniel Johns is another. If you want to hear some brilliant musical talent from him, check out Silverchair's Diorama or the Dissociative's album, his side project.