I've said it many times before the Corona Live Builds really is fantastic. Most of my projects require multi-touch and to actually be able to test that on multiple devices within a few seconds is a boon not only to my programming but also to my temperamental creative process.
I deal a lot with visual logic and aesthetics so having to stop every few minutes to wait for new build on device is akin to waiting for that Photoshop filter to render back in the 90's - anyone remember that? Well, it was a wretched slayer of all artistic flow.
Yesterday, I had Jury Duty and the updated courthouse has wifi so I spent the day working on a multitouch project and, thanks to Corona Live Builds, testing it on various devices. It was one of my most productive days this month!
Nice job Corona team!