Tyler, great question. Our focus now is on improving the desktop experience. Since the Google mobile API does not allow a solution like ours to run our option is to build a native email client that would be fired up by sales reps when they wanted to attach their e-mails.
In the meantime we have seen other users make use of labels on their cell phones which does make that 'going through the sent email' process a bit more manageable.
We're also exploring an option that would allow users to tag specific emails and allow for current and future threads to automatically attach to the record specified the first time around. Would you find this useful?
GM, Celigo Productivity Applications