Just a quick note to say we've done some testing with Windows Server 2008, and FinalBuilder is fully supported on this platform.
FinalBuilder Server is also fully supported, provided you install the role for Web Server (IIS), with ASP.NET support and IIS 6 Administration Compatibility support (both of these are available as options when you install the IIS Role.)
There are no known issues with either product on Server 2008, however if you are experiencing difficulties please post here in the forums or email us at support.