I've been using Xobni for Outlook for some time now and we recently moved from an exchange-based email system to Google Apps... I'm using both Outlook and the web Gmail interface because the web on its own doesn't give me the social connections (linked in, facebook etc) and doesn't extend far enough...

I know they also have an iPhone Alpha out there, but I'm more interested in the Gmail Beta as I'm hoping it will allow me to say goodbye to outlook and its ridiculous machinations forever...

Actually I've been surprised that no one has taken Xobni over - I thought for sure Microsoft would given it has in the past been Outlook-centric.