Well, I'm not sure if they fit the "One Hit Wonder" definition, but I'd rate the Boomtown Rats as a band that deserves a lot more attention than they got.

Other than "(Tell me why) I Don't Like Mondays" they didn't have any so-called hits (that I can recall). But the entirety of The Fine Art of Surfacing is filled with gems. In fact, their first three albums are awesome.

I suppose I could add both The Plimsouls and Dramarama to this list as well.