Lots of QA services and software to help automate and simulate what your app looks like on different devices - specifically Android. This takes it to the next level by putting your app on real devices, letting you interact with it as it records the session and then replays that to you so you can find bugs.
To me this is the next best thing to having a room full of devices where I get to actually play with them myself (which would also be awesome) but until that day comes, this seems like best option.
CollageMo
Journal 29: Interactive Book Game