Here's a diff of draft 1 and draft 2:
http://fsfeurope.org/projects/gplv3/diff-draft1-draft2.en.html
And here's a diff of GPLv2 and draft 2 of GPLv3:
http://fsfeurope.org/projects/gplv3/diff-gplv2-draft2.en.html
Enjoy!
...meanwhile, I'm going to do some more work to adjust slightly the boundaries of each change on those diffs.