I'm using Linked-In as a way to remember to keep in contact with people from previous groups and jobs. Every month or so, I review my connections there and send off a few e-mails to check in with people. In a way, I guess it's an address book, but the nice part is that people there keep their own contact info updated for me. If a former co-worker changes jobs and home city, they update their info and I can easily contact them.
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