You know Facebook is getting popular when your dad joins up...
I've made a web app that uses the Facebook API to find friends that aren't on your list but should be. It's called "Two Degrees" because of the Six Degrees of Separation idea.
Two degrees uses Ajax and has been tested on Firefox2 and IE7. If your browser has an anti-phishing filter then it will take slightly longer before you see the page update.
Give it a go! If you have any comments or come across a bug, get in touch.