Will I have a better web browsing/computer usage experience on a 1080p resolution screen vs. 720p?
My experience says yes...I recently bought a 21" Samsung Wide Screen monitor which is fullHD (native resolution 1920 x 1080) and it is sharp like a razor. I was truly amazed even though I expected great things when I bought it.

How far back can you sit still be able to read web site text or word processing text on a 32" screen (typical size fonts and typical eyesite)?
Commonly 2.5 - 3 times the diagonal measurement of the screen is recommended for any type of TV viewing

Anyone have observations on how the refresh rate affects responsiveness of mouse movement with an HDTV?
I have not used TV with 'puter, but I expect that the higher the better.

david