Heh... I connected my TV to my Vista laptop the other day...
It was terrible! I had to choose between mirroring the laptop's screen... Or adding another screen.
If only I'd had to hack some random text file instead, it would have been so much easier to get the needed 1378 by 763 (or whatever the damn stupid 720p resolution translates to in PC resolutions.) As it was i had to trust that windows had automatically detected
As it was I got lucky and everything worked absolutely flawlessly, but as it's automatically remembered my settings if I decide to use a different system I have no idea how I'll change them. If only I'd been using linux!
(note to people lacking a sense of humour: sod off)