I haven't yet read the licenses in detail, so I cannot say much about them, but more information is available in the (updated) GPL FAQ. The compatibility table from the GPLv3 Discussion Draft FAQ can be pretty helpful, too. There's a Why Upgrade to GPLv3? text and even a video of Richard Stallman (Ogg Theora, transcript available) introducing the GPLv3, the rationale behind it and some of the changes in this new version.
(One nice advantage of the GPLv3 I like is that it's compatible with the Apache license now, btw.)
Probably the most interesting GPLv3 resource at the moment is Palamida's list of projects which already switched to the GPLv3, which includes a number of GNU tools (sed, tar, ed, bison, texinfo, cpio, coreutils) and some other major projects such as Samba. Currently the page lists ca. 140 projects which switched.
It'll be interesting to see how the adoption proceeeds. My guess is that in a few months it'll be hard to build distributions or embedded (GNU/Linux-based) hardware devices without GPLv3 code...
You might have already noticed (if not, you will, very very soon) that the FSF has released the first draft of the forthcoming GNU General Public License 3. You can leave comments on the license or help to populate the wiki, if you're inclined.
I think the Rationale Document will be very interesting to read (for me, at least).
I'll leave it to more competent people to comment on the pros and cons of the changes of this new version... I hope that in the end (after a few more months of reviews etc.) we will have a fine new version of the GPL which will suit the majority of the Free Software world very well.