UPDATE 11/27: Our Random.org-selected winner is Courtney W.! Congratulations, Courtney. Thank you to everyone who participated, and we encourage you to read the more than 100 wonderful comments left below. -SR —- The good folks at Motorola sent me (Shannon) a Xoom tablet to give away. No hidden agenda, no stipulations — they had simply heard how tablet computers can help people with autism, and they wanted to get two of their devices to people in the autism communities — one to my son Leo, and one to a blog reader. A blog reader who could be you! We TPGA editors had already planned to kick off the holiday season by seeding some positivity: putting up a gratitude post, and asking you readers to leave a comment about something that makes you feel happy or grateful — and we still hope you will. But now, if you like, you can…