There's a new "course" available for Corona SDK game developers -- and I put the word course in quotes because it's unlike the other courses here. It's actually a bundle of stand-alone tutorials (most of them video, but not all) showing different tips and techniques for Corona SDK.
Use this link: Misc Corona SDK Tutorials
It's free, all you have to do is sign up on the site to access the videos and the sample projects.
You don't have to start with the first one -- since they are all separate, just work with the ones that interest you.