You should try this some time. I've had varied (mostly awesome) results with APC at 1.5x tempo (Winamp 5.x DSP, the "simple tempo control" plugin). As long as you look past the fact the singer is suddenly turned into a woman or a pre-pubescent boy, a lot of songs actually sounds cool if not better sped up.
In fact, anyone who has A Perfect Circle - The Outsider, might want to use WMP (which has speed control built in) or Winamp (with the DSP thing) and try it at 1.5x, it sounds a tad heavier, and definitely easier to dance too... I like it.
Please post here your experiments (successful, hillarious (Rammstein comes to mind

), whatever) with speeding up songs.