joelaz:

This useful, free iPhone app updates your phone’s address book with your friends’ profile pictures from Facebook.  That way, when people call, you see their photo instead of just caller-ID.  It takes just a minute to update hundreds of contacts.  Note: when you get to the screen that shows all the available pictures for import, there’s a check box that says something like “request updated photos from friends.”  I unchecked that option since I thought it would email all my friends as a way to virally market the app (ie. spam all my contacts).

Wow, clever.