FriendFeed have recently (don’t ask me when exactly) added the functionality to find your Facebook, Twitter, GMail, Yahoo! & Hotmail contacts who also use FriendFeed. It could not be simpler to use:
To access the friend finder options first go to friendfeed.com and log-in. On the right you’ll see your friends panel, click the “Browse/edit friends” link at the bottom of this:

Browse/edit friends
You will now be faced with your friends page, click the “Find / invite friends” link at the top right of the friends panel:

Find / invite friends
You should now see the following panel, with icons from Facebook, Twitter, GMail, Yahoo! & Hotmail, all you need to do is click on the relevant icon and follow the instructions.

Find Friends on FriendFeed - Updated.
Why this is hidden away behind 3 steps and not put right on the main page I can only guess, but it is definitely a time saver compared to manually adding friends on friendFeed!
And here I thought it was just you being extra attentitive this morning when I found your friendfeed add email in me inbox.
Seriously, though Andrew good write-up, when you going to add some social links or a tweetmeme doufrey button to help it easier to share your thoughts.
Paul