I wanted to tell you that I have had quite a bit of sucess on the ArduinoDroid app. I don't know what version you tested--I guess if I look at when you posted then I could get an idea... anyway the 3.8.1 version I have is working pretty well for me and my Mega2560. I have had some crashes and am working with the developer to improve things as I am one of his beta testers. Hope you will contact me if there is anything that I could help you with in getting yours working. I had some communication issues at first as well... after helping the program in finding my usb com port, it seems it is working quite well now.