i doubt it would save as .fbx if it doesn't export to it. they want people to share their creations all over the internet, and everything you play against to be someone else's creation. it's probably a very small format of their own with just enough information for spore to figure the rest out procedurally.

lots of fun though. i'm uploading a video now. great built-in video-capture and stuff (the videos are small and wussy, but hey it's all in realtime and it's for putting on youtube).

julz