Ehh... for me, most of the originals are far, far better than the covers. That being said, I do like a few of the covers:
Goldfinger - Just Like Heaven
The Gourds - Gin And Juice ... (cause it's hilarious)
John Cale - Hallelujah ... (also, Jeff Buckley and Rufus Wainwright's versions are better than the original, I just prefer Cale's)
oh, and as for Cake's version of "I Will Survive", second'd
and... that's about it, I think