íViva la Cobra! by Cobra Starship...a LOT. Mostly this song (which is also my most-listened song overall on last.fm - does anyone else use last?):
Probably not to many's taste, but I love poppy stuff like this. I'm waiting for their latest album to arrive, so I've been hammering the previous two.
...also Fearless by Taylor Swift. Not my usual thing really, but I think it's brilliant.