Address book feature for emailing snapshots

I have been emailing snapshots from all over to my non-SL playing friends trying to convince them to join up.

But I have to remember and enter their email addresses each time I send a shot.

Surely there could be a way that the program remembers a previously entered address (similar to History) so you could just type in the first few letters and it could pull it up -- if not an entire address book feature.