Yeah, there are reports that all these new HTC phones (EVO, Inc, etc.) that have the protruding camera lenses are falling susceptible to scratches to the housing and lens cover. At the end of the day, micro-scratches will not affect the picture quality too badly, but it's obviously a poor design decision on HTC's part.
That being said, having a DROID, I empathize with EVO owners who don't want to add more bulk to their device. So, what I'd recommend is what I do:
1) For the most part, the phone is naked; no bulky cases or sticky screen films.
2) When it's not in my hand and it's either in my pocket or on a surface, it's always in contact with one of these microfiber "suede" pouches.
http://www.sfbags.com/index.htm
http://www.sfbags.com/products/cellphonecases/cell-phone-cases.php
This is a GREAT pouch for our devices because:
a) it protects from the dust/lint that's in your pocket that might creep under your glass,
b) it protects from the other hard items that you might inexcusably be putting in contact with your device (e.g. keys),
c) you can put the phone either INSIDE or ON TOP of the pouch when on a table or something, and
d) it acts as a GREAT screen wipe, to wipe off those pesky fingerprints. Honestly, I returned the stupid screen skins and bulky hardcases for the simple solution of this pouch.