Just to pitch in a new thought on an old thread... I just got a few Boxwave protectors for my T|X, and they're truly wonderful.
Applied almost perfectly (two small specks of dust under it near the edges of the screen - my fault, probably - but barely noticable), covers the entire screen completely (I mean
no space around the edge), and only took me about 15 minutes to get it on, with my first try (I'm relatively new to screen protector application - my Zaurus never needed one, as I only tapped on the screen and used the thumboard for text input, and my old Clie already had one on, that I never took off as it worked well).
The adhesive isn't as strong as the Palm ones, which is good. It holds very well, but easily peels off to reapply it, need be, and doesn't seem like it's going to tear the screen off. It feels similar to peeling a post-it note off a piece of paper, except a little stronger.
The ones I have, the Anti-Glare ones, have a very nice tactile feel when writing on the screen, almost like paper feels like with a pencil. To me, at least, it seems to make writing Graffiti on the screen much easier and more accurate. Probably becase I'm incredibly used to writing with a pencil.
(All those hundreds, no, thousands of math questions over the years.)
So, although your milage may vary, I'd suggest at least looking at Boxwaves, if you don't mind the slightly-steep (although in my mind worthwhile) pricetag.