Jay Dee aka J Dilla
Tegan & Sara (I know, I noticed they happened to be everywhere about a week after I heard them on TBSOWFMU)
Kelly Clarkson
I already knew and liked Teddy Rockstar's work, but really started to get into it because of Tom.
I downloaded Jesus Lizard's Goat from eMusic because of the debate from - was it three weeks ago? - and have to say that, while it's pretty good, I agree with The Kid. It's no Gilbert O'Sullivan. I'll probably check out Imperial Teen and Jay Reatard out one of these days.
Does other music we've discovered/been reminded of through WFMU count? Then I'd throw in Flaming Fire, Chet Baker, and DJ Rupture.