Wikis

I like the sharing concept. It would be wonderful for working on drafts of a joint paper, for example, instead of emailing the thing 'round and 'round. I spent some time on the library wikis, and especially liked the SJCPL subject page. I don't exactly know what makes it a wiki - can librarians just change/add stuff to the page? Having information/signups, etc. be easily modifiable would be a definite plus.