Google+ seems to be starting off as a big hit right now, and because of this Google obviously wants to keep the momentum rolling. They are still hard at work improving it and adding features. Google’s Rohit Khare recently announced that they are working on an address book uploader feature that should roll out in the next few days. The uploader takes your contacts, that you exported from any email application that does CSV or vCard formats, and imports them. Furthermore, the uploader doesn't mix your imported contacts with all your other Google contacts; it only stores contacts that you put into your circles. Very slick! You can check out the video of Rohit Klare describing it above.
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Source: GooglePlusTalk.net via SlashGear and Google