Our buddy Fabian just put out his latest app, AddresSave, which automatically takes contact info from your email and adds it to your address book.
As you probably know, there are other apps out there that do something similar such as Gwabbit. One thing I like about AddresSave, that isn’t included in Gwabbit, is the option to set a “block” list. With this option, you avoid unnecessary entries.
As this is a new application, it would be interesting to see how well it can sniff out redundancies over a long period of usage.