Rated 5 out of 5 stars
The idea behind this is pretty cool and I can't wait to see what's coming. Right now though, there are still some limitations and/or bugs that need to be weeded out. For instance, the TB address book integration appears to only be able to import the "Personal Address Book" and the "Collected Addresses", but not any other address books one might have.
I'm staying tuned for this one.