I want to thank everyone for all the wonderful comments. It really touched me.
I used random.org to pick the winner for the free UStamp pass. The results are in:
True Random Number Generator
The winner is t_lockart5. Congratulations! Please email me at firstname.lastname@example.org with the subject line UStamp Pass Winner by 9:00 p.m. Eastern Time on April 29th to claim your prize. If I don't hear from you, I will choose another winner.
Have a great day!