To add to Linda's post above.......
You can also register the litter/kittens online. Here is the link
http://secure.cfa.org/gated/login.aspx?ReturnUrl=%2fgated%2fHomePage.aspxFrom this site you can register the litter and print your blue slips and yellow slips (the prepaid registration forms for individual kits). Then you just fill in what you want to name the kitty on the yellow slip and mail it in.
Sometimes I know I have my eyes set on keeping a kitten in the litter so I pre-register one kitten and just get blue slips for the others that I know will be sold to pet homes.