I sold the team on the idea of using a Wiki for a good project collaboration tool. I wanted to use SnipSnap because it looks good, but I noticed on it's Feature Matrix that there is no file upload. Shucks - that might be a show stopper. I'll probably end up using Very Quick Wiki.
This article from Javaworld shows how easy it is to use POI. Cool - I'm sold!
I saw it a couple weeks ago, but now Erik appears to be updating it regularly. Just in case you didn't know - you can find it here. Erik is an Ant Guru and has written many cool Struts extensions (i.e. LookupDispatchAction, XDoclet integration). He's made my life a lot easier with his Ant wisdom and Struts goodies - thanks Erik.