1.) Domain names - Secure a domain name for your sister or best friend. GoDaddy.com has reasonable prices and there are many discount coupons out there to get them for even cheaper. They might not understand why that's a good gift, but they may thank you someday.
2.) Free eBooks - There are many great authors who have given away their new books for free this year. One of our favorite authors here at Daily Axioms is Seth Godin. You can get his newest best seller, Tribes, for free here. Or just buy a hard copy.
3.) Teach - Show your dad how to use RSS feeds. Give your cousin a new tool for finding jobs by searching on Twitter. Direct your roommate to one of your favorite blogs to read. Hopefully what you are learning online is valuable information; pass it along to someone who could use it in 2009.