What I failed to realize was that the first thing you need to do with Windows Home Server is install the updates.  Microsoft has the WHS Power Pack 1 (or PP1). It combines all previous updates/fixes and supposedly improves network performance.  The biggest thing I got was support for Vista 64-bit.

If you have the HP MediaSmart Server there is the v1.3 software update.  This update delivers enhanced media streaming capability from PacketVideo, server-side anti-virus protection from McAfee.  PacketVideo is also refered to as PVConnect or Twonky and it replaces Media Streaming with more support for uPnP devices.