FacebookSync syncs your Apple Address Book with data from your Facebook account. Specifically, it pulls down your friends' names, emails, AIM, mobile phone number, and photo. Adds missing photos, inserts missing information, and adds missing records to your Apple AddressBook. This is great if you use iChat or Bluetooth-sync your AddressBook with your cellphone.
Note from developer:
FacebookSync violates Facebook Terms of Use (6/7/2007)
Facebook contacted me and requested that I stop distribution of FacebookSync since it is in violation of Facebook's Terms of Use. Sorry to all out there who will miss this useful application.