Somehow, Facebook is very protected about you accessing your friends’ info in an automated way.
For instance, recently Facebook tried to block a Google Chrome extension that exported the info on your friends, and also blocked a Facebook contacts CSV export tool (alredy archived at the WayBack machine).
Luckily, Yahoo! has a Facebook Connect deal with Facebook that enables Yahoo! to import the Facebook contacts.
So, if you have a Yahoo! account, you can always that as a back-door: import your Facebook! contacts into Yahoo! contacts.
Importing is easy: start at the Yahoo! Address Book Contact Import Landing page, then go from there.
The Yahoo! Mail Transfer Contacts page offers some other import sources too (but no Facebook source yet).
For instance, these are possible:
Other tools can directly import from Facebook, for instance,
Skype can, and many mobile phones can too (so you can do the “Facebook, mobile phone, Outlook, export” path too).
–jeroen