Ever since I bought my HD2 I have been concerned that I might scratch the screen (… I know myself well enough ;-)) Let alone the constant finger-smear that appears.
I found (and use) an incredibly cheap – and good quality screen protector on Amazon.
FX-CLEAR screen protector for HTC HD2: Amazon.co.uk: Electronics & Photo.
Note; I am not affiliated with Amazon – nor do I get any kind of endorsement or anything from the manufacturer. Just a happy consumer :-)
Just thought I’d share this find.