i have a mythtv box that i use as a VCR
i then use mplayer on my powerbook with ati 9600 graphics to watch those recordings on a widescreen TV using a standard composite cable.

my question is can a mac mini can output widescreen 1024 x 576 PAL through its... Apple DVI to Video Adapter, as sold separately ?

-geoff

There is also the option of using 2 or more internal DVB-T tuners in your Mac's PCI slots, not too sure what sort of software would let you do all this though. I'm currently toying with this idea but using a spare Linux PC running MythTV, apparently my Macs will also be able to view TV via ethernet through this box.
A video router? ;-)
"It" will live in the lounge room as it has a flash graphics card.
Thats the theory anyway :-)
Let me know if you are interested in how I fare...