Karsten had a great time working with the Yahoo team on their Windows Vista Messenger client. They've posted a video preview of the app with some fun features like the group skinning in the fantasy football league example.
Karsten - at the risk of exacerbating the speculation that my office is at the beach, hook me up with a rippling ocean water skin to rendezvous with surf buddies. What will the voice visualization do with the background surf noise? :)