I was planning on doing a bunch of "tweets" from Disney World on our upcoming vacation. However, I just found this site Twisney.com, and they take your twitter, put it on a map, allow pictures to be added, and also provide a link that you can share with friends and relatives to your "real-time trip log".
They also are providing a mechanism to share the wait times with other readers of their site. I think it is a cool idea, but it will only be successful if a number of people are actively posting. That is, unless Disney wants to join in the fun, and provide some of this information close to real-time for the benefit of its guests :)
Check it out...
****EDITTED - Twisney.com is not functioning any longer as of Spring 2009