I think the Droid screen is made of Gorilla Glass so it's pretty tough to scratch. But still, I wouldn't say a screen protector is stupid. What you lose in screen sensitivity wouldn't be much, at least it wasn't much on my iPhone.
I got a nice case from Verizon because I had dropped my Droid on my tile floor and almsot had a heart attack. Luckily it only scratched the metal casing around my screen. It didn't add much bulk to the phone either.
I think I'm going to pick up a Invisible Shield from Best Buy tomorrow.

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