That little dude is called Evo-Saur and he is my first creation in the recently leaked Spore Creature Creator. The Creature Creator reportedly was made available by EA but was quickly taken down. The files are currently floating about many torrent sites such as this one.

Note that currently it is only the free trial version of the Creature Creator that is out there. The trial version and the full version should be released on Wednesday (a delay of one day) according to this EA page.

I am currently having great fun tweaking around with my creatures such as my Crocasaur which is above. Even with the limited number of options available with this leaked trial version it is clear that people will have a great time playing about with it.

I think EA are making the right choice with releasing the Creature Creator early, it is going to allow people to explore and make crazy creatures before the full game comes out so that when people can get down to playing they know what to do and make creatures to actually play with, rather than jokes.