Is it worth re-filing my taxes?

Whenever January comes around and I receive my W-2 I become extremely impatient and like to finish my taxes as quickly as possible. I just recently filed and am awaiting my refund. I completely forgot about the donations I had made to the Salvation Army last year and just received my "2010 Gifting Statement." I only donated about ninety dollars and was wondering if it worth re-filing my taxes over. If I were to deduct them would I receive a significant amount back or would it end up being more trouble than its worth? Any help would be wonderful, thanks.