The subject's been covered pretty extensively in the past, so you might be able to glean some useful information from these threads:

http://www.internettablettalk.com/fo...ad.php?t=13726
http://www.internettablettalk.com/fo...ead.php?t=7293

There are some others that'll come up if you do a search for "screen protector" but these two probably have the most relevant info.