theodp writes: "Where have you gone, Mavis Beacon? A nation of smartphone and tablet typists could use your help. You've seen people type fast-and-furiously on smartphones and tablets, so you know it can be done, but how exactly do these one- and two-fingered wonders (YouTube video) manage to do so? Is it their reaction time? Technique? Both? Back in the day, touch-typing teachers showed kids the secrets to higher word-per-minute scores on their Smith Coronas. Later, typing tutor software got kids up-to-speed on PCs. So, with over 1 billion smartphones and 200 million or so tablets shipped in 2013, what are the best software and tutorials that teach mobile typing techniques? And what platform specific features — iOS, Android, WP8/Win8, BB — do you find make your mobile typing life a whole lot easier?"