There's an interview on Channel 9 with
Windows Home Server Dev Lead, Chris Gray, where he talks about the extensibility model and then walks through how to create an add-in for the Home Server console using Visual Basic Express.
http://channel9.msdn.com/ShowPost.aspx?PostID=354105
Get Chris's code here:
http://channel9.msdn.com/ShowPost.aspx?PostID=354555
Also, the Home Server team is working on Visual Basic samples. Way to go guys!!