HP has released the Media Center Extender firmware update for MediaSmart HDTV owners.  If yours hasn’t checked for updates automatically, you might want to force an update check to see if it is available.

HP also has their MediaSmart HDTV Extender webpage up for troubleshooting and instructions.   Remember that you need Windows Vista Home Premium or Ultimate to take advantage of this feature.  In addition you need Windows Vista SP1 or KB938126 (x64).  Vista SP1 highly suggested instead of just the update patch as it has been known to improve Extender performance.

Update: Press Release was issued today, read it at eHomeUpgrade.