Html Pop up messenger

I've been on some sites where members can send messages to each other via a little pop up html box. Has anyone tried making something like that for vbulletin? Now that would be really cool.

thanks

ryan

This has come up in the past, you may want to do a search here to find out the latest on this project, of if anyone is working on it, i would love a instant messaging system for my forums, but untill then, i can live with the PM hack.