I've been waiting for these, but I was utterly disappointed that the only provider right now is LinkedIn (apart from Sharepoint, shipped with Office 2010) only supports 32-bit Office installations.

If they want this to fly, they need to get providers out there and make them accessible to everyone.

I really like Outlook 2010 so if they can get this right it would definitely defend the role (thus far) of the desktop-application.