Thanks to some intrepid hacking on another forum, a complete text dump from the Creature Creator is now available. Thanks to Maxis, it also contains text from the full game: help files, tooltips, mission text, communication options, badges and their descriptions, UFO weapons and tool descriptions, the works.

I've uploaded a copy of it here: Spore Text Dump.zip

Needless to say this contains massive amounts of spoilers, but it will answer a lot of questions about what you can do in Spore if you browse it for awhile.