Brilliant. Frickin' Brilliant. Windows users, check out this very nice little Address Book Application.
Then read this blog post about making the most out of managing your contacts in a connected world.
I'm hoping the author of the Address Book Application will one day offer 2 things:
1) an open API to offer a "live view" into the address book data, for both reading and writing
2) an open synchronization API
I'm assuming it already offers vCards ? is it able to recognize duplicate address book data and "merge" it if needed? Anyway, mad props to "Jib".