Just in case you were wondering how scratch resistent the screen on the BlackBerry Curve is, it looks to be pretty resistent. I, however, still STRONGLY reccomend that, if you have a BlackBerry Storm or plan on getting one, you invest in some type of screen protector like Invisible Shield or something similar.
The BlackBerry Storm actually comes with a screen protector already on it but it appears to be the kind that will wear out over time. Do yourself a favor and buy a screen protector. They are definitely worth the $7.00 to $20.00 that you will pay for them.