Simple website, simple concept, great gift ideas (apps.facebook.com)

Holiday gift buying is tough unless you like the same things as the recipient. If you don't, the best strategy is to get recommendations from someone who does.

WishGenies puts this concept in action. It can definitely help you if you haven't finished your shopping yet.

On the tech side, it's a Rails3 app on Heroku, w/ a mongodb backend. Please... please make me have to slide that little 'scaling bar' to the top. :-)