I bought it yesterday, wonderful stuff.
If you've got the whole, legal, non-demo version, you can drag png:s into the creation menu to get other peoples' creations! :D
So, here're mine, in no particular order. Some of these were made by a friend as well, we had a blast. Any descriptions and names are the result of staying up to 5 am designing misfits.
Oh, and some browsers are kind of not working with this, so I recommend saving the png to somewhere, then just drag and drop into the Creature Editor. Again, if you don't have the legal version (no text about demo when you start it up), you're not going to be able to import them). Remember, it's in the Anatomy Editting menu that you have to drag the png in for it to work.
And my pride and joy, the one I've spent most time on ('though not nearly as much as I should've had...)
Some of these are... rather scary to see in action. I'm especially afraid of number 1 and 7. You may notice some of these are similar in design; that's because we thought we lost the first batch (created with the demo) and made some that were similar to them. Also, number 12 never ceases to give me stomach cramps due to laughing. Check out the way he moves.
Oh, and here's a bunch of creatures I found on the net. Specifically /v/ on 4chan.
And check this baby out
That's right, a friggin' Chocobo. I'm in love with it. You can get the editor online on spore.com for 10 friggin' dollars. That's a small prize to pay for hours of playing God... oh, and I guarantee that if you are able to, play the Editor with friends. :) Taking turns.