A few of them have been popping up in different places. Linde offers a Hunter's wishlist tree that's chuckleworthy (the 51-point Marksmanship talent is called Swoop: "The next item you loot costs 0 DKP"), and Menae has made a much more cynical (and therefore hilarious) Priest talent tree. Finally, Priests are able to get Holyform (the tooltip says that the talent was really put in place just to shut the forum QQers up), and my favorite is probably (one of) the 51-point Shadow talents: with Improved Shadowform, "Your character is replaced with a Warlock."
Unfortunately, just like the WoW Item Creator, there's no way to track what other people are making-- I'd love to see a list of the "ten most-viewed talent trees," just to see what people are coming up with. But this thing is definitely a lot of fun to play around with, whether you're trying to perfect what Blizzard does, or just mock them. If you come up with a good one, post it below.
[ Thanks, Ootah! ]