There's a difference between "Christian" bands that are recording music for the P&W crowd and bands composed of Christians who "crossover" between the Christian scene and the secular scene. I can't think of any of the P&W stuff I like. Crossovers, though, I'd point to a few that have already been mentioned - Switchfoot (pop/punk, kinda like Jet or maybe the All American Rejects), Flyleaf (metal), Needtobreathe (southern rock). The Cold War Kids got "outed" as a Christian band by a blogger who found they'd met up at BIOLA, but never presented themselves that way.
Sixpence None the Richer also comes to mind, not a heavy rocking band by any measure but I really love some of their stuff, especially the material on their autonym album that DIDN'T become singles (I like "Kiss Me" but get sick of hearing it in grocery store aisles).
Also U2, by the way - at least, all of them except Adam Clayton...