I just received the eBay protectors in the mail last week...they were the EzGuardz: 3 for $3. They give you the option of applying them with or without water...the 'with water' option obviously being a better install. However, I'm too paranoid to use the water method, so I applied it the 'dry' way.
So far, they're worth every penny. I have a couple of imperfections because I didn't use the 'with water' way, but overall, I definitely can't complain. There's no adhesive on them, they just cling to the screen. I haven't lost a bit of touch screen capability and the clarity on the screen is still excellent. The only time I notice imperfections in the application of it is when the screen is off.
I know there will be nay sayers that refuse to believe you can get decent screen protectors for that price, but if you're open-minded and you're someone who doesn't mind dropping a whole $3 on eBay, you won't regret it.
They accomplish the 3 main goals I had: protect the screen, don't sacrifice touch sensitivity, and don't hinder the viewing quality of the screen.