A colleague of mine found some javascript and php to add faceboook style chats to any website. I'm currently not interested in the messaging portion but would like an easy way polling of updates to a website. I think a bit of testing around with this code and one could create dynamically updating without hitting the refresh button.

For instance I am working on a CMS now, and it would be neat to have two people in remote (or close) locations be able to work on the same web site (WYSIWYG style) and each see eachother updates. One would have to figure out some kind of locking to prevent making changes to the same area but its not unrealistic. Google docs already does this really well.