I have a Home theater PC setup connected to a Sharp 32 inch LC-32PD5X LCD TV.
I have spent some time trying to get a 1 to 1 pixel mapping at the native resolution of 1366 by 768 but have made little progress.
I have played around with the tool PowerStrip and have tried some obvious things (ie creating a new setup at 1366x768 at 50hz / 60hz) but no luck.
The best I can do is run the TV at 1280 by 720. This looks ok for things like watching TV, DVD etc but results in what I would call "messy" fonts in Windows because the TV is converting pixels from 1280 by 720 to 1366 by 768.
I've read that 1366 by 768 is a pretend high definition mode that some TV manufacturers use to reduce costs. Maybe this is just asking to much for a cheaper TV to do.
Overall, the TV is good enough for my needs, so just buying a proper 1080p TV is not an option (for a few years at least).