One of the problematic spots for Windows Home Server are the networks, where it is supposed to work. During Beta-testing we found that home networks are often not up to the task. It's either the name resolution, or UPnP does not go through, or some other problem. Well, usually it works, but problems are a bit too often to be comfortable. A few last months me and a few more members of the team were working on a troubleshooter to help detect and fix those problems.
Here it is: Windows Home Server Toolkit V1: http://www.microsoft.com/downloads/details.aspx?FamilyID=de10c0e9-2d46-4770-91fe-6b84ae06f960&DisplayLang=en
Beside troubleshooting home networks, it also can report the problems to Microsoft and do some fancy things on the server like cleaning up backup database.