As I didn't sign into Messenger over the weekend I didn't become aware of the refresh to the beta version of Live Messenger. In my previous post on the leaked version of Live Messenger I talked about building Addins using the new managed API. In the official update (version 8.0.0689, available via the beta program) this API is also now available for you to begin developing with.
The other piece of information I would like to share with all laptop and tablet PC users who have more than 1Gb of RAM on their machine relates to the occasional inability to hibernate. If you have issues with hibernation then check out this knowledge base article as it might help.