Don't feel too bad. Drops happen. Eventually all our Blackberries will have nicks and scratches. I remember most of my devices having scars from use. I always felt like those marks gave character to the device; showed that the device was actually being put to good use.
If it really is an eyesore, case it up and keep going. Eventually when Passport parts become commonly available, you can always replace the damaged sections.
-- Passport, Virgin Mobile (Toronto)