I am very impressed by the focus on details in the social integration apps (calendar, contacts, message).
One of the things I noticed just now is how if you have enough information of a friend (I am guessing this is based on email), AND you don't have them on linkedIn yet, there will be a linkedIn 'send invitation' button in their contact profile page.
(I am starting a new thread, because i think something small like this will probably be overlooked by most people)
