CoBook

CoBook touts itself as "The Smart Address Book For Mac" and based on the introductory video I think I believe it. I've been pretty bummed out with the overall experience (and look) of the latest version of Apple's official Address Book app and this appears to be a much slicker integration into the operating system; not to mention the Internet and social networks at large. I've not installed it yet but if you find yourself managing a great deal of contacts and want to have an intelligent place to flesh out their info and tag them with relevant info; this seems like a winner. The biggest bonus is that it, apparently, integrates into your existing Address Book / iCloud data so you aren't missing out on that level of convenience.

via Chad.