The adwords team are trialling AdWords ads that enable a prospect to subscribe directly to a Newsletter etc.
I believe these will be called ‘Communications Ad Extensions’ and look like this one I stumbled over recently
This ad picked up my Google ID and pre-populated the email field with it making it a one click process for prospects to register for a newsletter.
The Communications Ad Extension is another Ad Extension in an increasing portfolio being offered by AdWords
Are your ads using Ad Extensions to maximise your online advertising ?