I hook my laptop up to a 46" 1080p TV through HDMI, it's only got a Mobility 3650 (I think). It looks fine, sometimes I use it to watch blu-ray and I've compared side by side with my ps3 (yes, I have two 46" 1080p TVs) and it actually looks slightly better, but that's because my PS3 is hooked up to a LCD, and my computer gets hooked up to a LED-LCD, when I reverse it, the PS3 looks better, but only slightly.
You just might want to mess with your settings though. Letter size, resizing for screen area to fit, sometimes it's too small even when set to 1080p, and sometimes it's too big, and some tv's do not support all or certain audio types, so some things won't play the audio through the TV, and others will.
Edited, Aug 4th 2010 5:20pm by VayMasters
(> <) This is Bunny. Copy Bunny into your signature to help him on his way to world domination.