My son is really into PUSA mostly because we brought him up on Caspar Babypants (check it out if you have kids, Stompy the Bear rocks). He loves Peaches, Dune Buggy, Mach 5, Volcano and 5500 Miles. He has great taste for a 5 year old, obviously.
I picked up their anniversary CD a while back. They have a couple alternate versions of Naked and Famous on there. One's a demo. There's something about at least that one I really like. Maybe it's the rawness of it; they even swear!
It always amazes me that Hank Hill knows the words to this song, which implies that he likes the band and I can only imagine he first gave them a listen simply because of their name.