Cobook is a powerful alternative to Apple's built-in Address Book. The app, which lives in your menu bar, allows you to quickly and easily look up, add, and edit contacts on the fly. Its flagship feature is the ability to integrate with your Twitter, Facebook, and LinkedIn accounts. By giving Cobook access to these social media sites, your contacts can be automatically updated with the info your friends and colleagues have posted. The app can fill in this data automatically, or if you're worried about import errors, manually. Cobook stays in sync with Address Book, so anything you do in the app will stay updated on all your devices via iCloud. Take a look at this video to see just how speedy and powerful Cobook really is: Cobook is in public beta and free to use, so give it a shot!
Ensoul - Beautiful contact photos made easy There's an unfortunate gap in Apple's contact system: if you set a photo for your friend's contact entry from your phone, their images will beautifully fill the whole screen when they call. If you assign the same photo from your Mac's Address Book app, however, the image is saved at a smaller size, and only shows up as a thumbnail when they give you a ring. Ensoul is an app for your Mac that lets you assign great full-size contact photos from your full photo library. The app sports an easy drag and drop interface, and even includes some fun photo effects. Ensoul is available on the Mac App Store for just $9.99.
Postable - Gather mailing addresses in a snap Whether you're planning to send your wedding invitations or you've simply lost track of your nomadic friends, Postable makes collecting mailing addresses from a big group incredibly simple. Once you've signed up, the site provides you with a simple public link. It's your job to email the link to your friends. Each person will follow the link and enter their info, and soon you'll have a central and up-to-date contact list. Postable lets you export this data to your Mac's Address Book, Outlook, or Gmail. You can even save out an Excel spreadsheet or print mailing labels. Postable is secure, free of ads and spam, and won't cost you a dime. Give it a shot! (Images: 1 & 2. MacPaw 3. Postable)