How bad is the dent? You say the laptop still work, so who cares about a small dent.
You do realize that could be repaired if you were to take apart the laptop and bend the metal back, just be careful not to bend it too much as the metal could be come weaker. Since your laptop has already been dropped and has noticeable damage most likely apple wont warranty it anyway so you don't have much to loose as long as you are careful when you take it apart.
wait, do you mean that dropping my laptop voided my warranty?
Try contacting member MacService. They seem very reasonable and are members here. Get a quote from them.
If I were to repair that machine, I would probably straighten the metal of the lower case and replace the palm rest assembly. There will still be a blemish on the side, but it wouldn't be popped up like it is right now. The part is available for $250 from ifixit.com. Just keep in mind that repairing itself could void your warranty.
oh, wow! Just visited the site and it looks amazing! Thanks cwa107, while I'm at it I think I might upgrade my HD... (you sure I can trust them with my laptop though?)