Now THIS is awesome. Keasy is a keyboard case for your smartphone. It is unlikely to be released for the Galaxy S2 as that's quite an old phone now, but it is going to be available on the Galaxy SIII within a few months. First off, Keasy needs some funding to bring this dream case to life, so be sure to hit up the Kickstarter page to fund it!
Basically, the keyboard is stored in the back of the case, and when you need it you slide it out and then slide it onto the front of your phone. The keyboard is clear and it sits on top of the on-screen keyboard, so you can still see your keys as you learn to touch-type again on your smartphone. The Keasy website is already live, www.keasy.co.uk but it currently just leads to the kickstarter page mostly. It is going to be updated imminently though.