I installed and played with Messenger Plus last night. Damn, that's a whole lot of fun. It kind of turns MSN Messenger into something more akin to ICQ, with the element on fun. You can't really top telling you chat friend that his father smells of Elderberries in your very best Python voice! I spent most of the night sniggering and with the added bonuses that come with MSN 7 Beta it's twice as nice!

Here's a full feature list of Messenger Plus