For those friends' addresses you don't have, you can ping them on Facebook, send a text, or even simpler, just email them through Postable to request they fill in a simple form that automatically updates your address book. The good thing is, unlike similar apps on Facebook, they're not signing up or opting into anything when they do. (Don't you hate that?)  But keep in mind that unlike the other services mentioned above, there is no option to upload contacts from Hotmail, Outlook, Gmail, and so on--just good old fashioned manual entry and/or an Excel spreadsheet. 

ConXt makes it easy to organize contact information in one place on the web. You start by signing up for a free account and then can import contact information directly from Outlook, Yahoo, Hotmail, Gmail and Facebook, or request that conXt send emails directly to people you want information from. Once you have people's information saved, you can categorize, tag, mark birthdays--whatever you need to do to stay organized. 

Speaking of smart, Smartr is another cool contacts organization app that works in similar ways as Brewster, namely organizing by frequency of contact and updating automatically. But Smartr also includes helpful information like which email address is used the most for a particular contact (like for that person who has eight different emails), as well as a history of the most recent interaction AND contacts that are shared in common. It's like a contacts app and a pseudo social network in one. (Free, iOS, Android, Blackberry)

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