Built this in 24 hours with 3 other friends as a part of an on campus Yahoo hackathon. We just finished working on the game, so it likely has many bugs. The game is built with html5, and the backend uses now.js. This works on the computer, iPad, iPhone, and Android devices. I am very tired right now, so going to leave this running, and go sleep! Game inspired by Wordament on WP7.
You can use the keyboard to type out the words. There are a few bugs with that but it might be much easier. The game figures out which letters you want to use as you keep typing. Just press enter when you are done typing out the word.