I know what I'm getting for most people, which is like 80% of the work...
my dad is getting this sweater:
http://www.lastexittonowhere.com/shop/product/hill-valley-hooded-top/
my mom's getting a new computer (mostly spare parts from when I upgraded my motherboard, but I still have to buy a case/cdrom/OS)
my sister's getting a couple seasons of felicity
my niece is getting spring/summer clothes
I'll probably bake care packages for my cousins in LA and Norway... no clue what I'm getting for my brother-in-law, though.