I read about TasteBook on LifeHacker today and it seems pretty awesome. The general idea is that you upload your own recipes (or maybe old, family recipes that you have written on index cards in a card box somewhere) into your profile. You can also connect to popular recipe sites and download recipes from them into your TasteBook. You can either keep all of your stuff online and share it with your friends or, once you have 100 recipes, you can have a full-color cookbook created and mailed to you for like $35.
I haven't had the chance to play with this yet, but I am excited to check it out, as this site lies in the intersection of two of my interests, technology and cooking.