typically the resolution for an LCD hdtv is 1366x768, this resolution is not enough pixels to make a very good pc monitor, especially for the size, especially for the size most of them come at...for gaming it will be awesome but for every day PC use it will be difficult
The price of LCD TV's has dropped quite a bit in the last couple months, after the super bowl they will probobally drop a little more, If you can get a deal on a TV its pretty easy to find a cheap 19" for day to day stuff for an extra $120