I basically use mine for everything. It runs my HDTV and almost all audio to my receiver. Having the HDTV Tuner card is great, we cut our cable and I still get about 10 channels analog, and I can tune them using the hack. Not bad, I'm enjoying it a lot, and saving $100/month to Rogers. My roomate has a large collection of TV series', and I have a huge movie collection. I can access and view all of his stuff on the network plus mine, so I have an almost unlimited supply of audio/video. Over 1000 albums with covers.
I also have setup another MCE box, now check this one out. It's a beast. PIII 450Mhz, 384MB RAM, and an NVIDIA 128MB Ti4600 card. It can actually decode xvid while streaming video over the network. I dont have any content on this one, I set the My Documents to link to the shared folder on my main machine. Pretty good setup for anyone with an extra PC kicking around. Great bedroom unit.
Roger Cable 3250HD | JVC AV48WP | Panasonic DVDRP-82 | Kenwood VR-509 | XBOX