I have to run but wanted to post some more resources on over-the-air local HDTV feature support in Windows XP Media Center Edition 2005:

• www.microsoft.com/hdtv - new sitelet we created to provide 3-easy steps to get educated and decide if HDTV PVR-support in MCE is for you. (Note: We're working with PC manufacturers to get order pages linked- stay tuned)
• ReadMe for HDTV Support in MCE05 - technically a readme for the Update that adds HDTV support for MCE05, if you're thinking of upgrading your existing MCE05 PC with HD support, you must read this first and make sure your PC supports the hardware requirements for HDTV.
• www.checkhd.com - brand new site created by the CEA, DecisionMark, TitanTV and others, type in your address and zip code and find out what over-the-air channels are available in your area and what kind of antenna you need.
• www.antennaweb.org - older CEA site, better for advanced users.

Post your questions here and I'll try to answer over the weekend.  Sorry, no HDTV support over Digital Cable w/ MCE05.