I have been using Live Mesh for quite some time now as they were our first Silverlight internal customer. Its been a pleasure to work with the Mesh team and its even more fun to be seeing your code being used in real life large scale online app. I have 2 Live Mesh invites to hand out. First two people to leave thier live/hotmail ids get them.
Update: They are all gone. If people want any more I see the Long Zheng has started a website www.ShareMesh.com for inviting and requesting Mesh invites. New users can register there.