If there's one thing that I hate about having multiple Android devices, it's the inability to easily keep application data synced across them. For example, I love hidden object games and usually play them on my Transformer Prime. But, if I want to play the same game on my Nexus, I can't pick it up from where I left off on my Prime. And that's just lame.
Enter a new [badass] app called DataSync. If you have app data and want to keep it synced up between multiple devices, then this is the app to have.