The ones I use the most are RunKeeper, SleepCycle, iReal b (great tool for practicing jazz), plus Yahoo Japan's app for looking up train routes. I also often u

The ones I use the most are RunKeeper, SleepCycle, iReal b (great tool for practicing jazz), plus Yahoo Japan's app for looking up train routes. I also often use Skype on my phone because it sucks less than on my Linux desktop.