Nobody responded to the 5060 vs Mac mini question yet? I cannot believe all these people (of otherwise good taste in electronics) are PC users!
I did hook up my 15" Powerbook to my 5050 once or twice using a DVI-to-VGA connector (and through the front panel VGA PC port of the Media Receiver). The picture was fine, although I never managed the Powerbook video card to negotiate 1366x768. I ended up with 1280x768, that is, with narrow black bars on the sides.
Interestingly, my Powerbook synchs up at 1366x768 OK with the 50" NEC plasma in our conference room at work.
This was with OS X 10.3.9; I have not tried it with 10.4.2. It is possible that Tiger will synch up properly; worth a try.
I also used the Powerbook successfully to download HD video via Firewire 400 from my Motorola 6412 DVR (and to play back HD video through the Pioneer's FW (aka iLink) input).