possible to drive two external mointors with mid-2013 new macbook air? Is it possible to use a thunderbolt -> hdmi and usb -> hdmi adapter to drive two external monitors (non-thunderbolt) with the new macbook air? If not, has anyone had success with any other options?
Have a look here: Air powers three monitors.

It looks like it could be possible. I'm not sure about the HDMI adapting method though. I do not know of anyone doing that yet.