Too bad it is read-only. :( TechCrunch Disrupt is coming up next month and I would have loved writing an Uber client for Google Glass. Having the user login on a desktop or mobile and then using their oauth credentials on a companion Glass app is all doable. They simply don't have any API for requesting a ride, however, once you have the credentials: https://developer.uber.com/v1/endpoints/

They have some deep linking APIs to start their apps on Android, iOS, or a mobile web site - but none of those will work on Glass. I suppose, theoretically, I can make the HTTP requests to their mobile site as if I were a browser and a user tapping the right buttons, but that it is a lot more brittle than having an API. It will break any time they change their web site.

Being able to say, "OK, Glass,""Get me a ride" and the car shows up would be exciting. "OK, Glass" "Show me the cost and time estimate to go to the Design Center" is just a boring advertisement. Right now their API just allows boring advertisements, pretty much.