Google has been adding lots of <i>widgets</i> to email recently, like RSVP on invitations, itinerary on flight booking emails, etc. These are pretty useful features and I believe a lot more are possible with the APIs being opened.<p>However, I feel the access control is very coarse grained. For example, RSVP widget needs access to only event related emails and itinerary needs only travel booking emails, but the API spec does not allow for such fine grained control.<p>IMO, given that google is able bucket-ize emails into travel booking, event, etc., and even user-defined labels for any custom grouping, allowing access on such buckets would be nearly as useful and much more user-privacy friendly. For example, an accounting app could still access invoices from my inbox to update my accounts automatically. Google could even push for microformats kind of annotation to make emails semantically richer.