Actually mate it has a bit more than that
Cable TV with on board hardware mpeg2 decoder, freeview, and 2 satellite dishes! One dish is pointed at some german stuff, the other is pointed to get BBC HD.
VDR is awesome. If you have a hardware mpeg2 decoder it will run on the shitest of rigs. I've seen it running on a pentium 233 mmx, using about 2% cpu power while recording! Not only does it do normal telly but will play just about anything you chuck at it. I think it can use mplayer to decode stuff, as you probably know mplayer supports just about anything.
But of course high def will need either its own full hardware decoder (expensive!) or a fast dual core cpu.
Whats this compiz like in your experience then? Obviously its gonna get Googled lol.