Well, I tried Pwnage on the leaked 2.0 ipsw (not gonna tell you where to get it, find it yourself). It did let me install a custom ipsw of 2.0 but.... It was like absolute crap! The iPod was extremely buggy and for some reason the iTunes store was missing. There was no App store either. Nothing all that good came out of it and I immediately went back to 1.1.4. So don't bother.