If you're looking for a solution to pull your contacts from various sources under one roof to manage, AddressBookOne might do the trick.
AddressBookOne went live this afternoon and offers members the ability to pull contacts from various sources (connectors) including Gmail, Facebook, LinkedIn, Exchange, and Plaxo. There are efforts being made to add Twitter, Yahoo and Windows Live to the list. AddressBookOne creates a single point of management with the ability to merge multiple instances of the same contact.
You have two levels of membership, Free and Premium. Free membership allows you to connected to up to three contact sources and manage/merge your contacts. Premium membership runs your 19.95 British Pounds (about $30 U.S.) annually and gives you an unrestricted number of connectors plus direct synchronization with your Windows Phone.
We're going to take AddressBookOne out for a test drive over the next few days and will get a review up shortly. In the meantime, for more information about this new service, head on over to AddressBookOne.com.