I put up two sites this month, but I'm not sure they qualify. They don't have any chance at growing into a startup, but I'm going to list them anyway. The first is a little game that lets you try to unscramble words [1]. It's hardest word list is from a post about the 1000 most useful words that came up here a while ago. My favourite thing about the site is that it fetches definitions and the like from wordnik so you…
1. You mentioned this, but it would be great if focus stayed on the input box. That would make it easy to play with just the keyboard, without having to tab.
2. Sometimes there are more than one legitimate solution (for example: scalp, clasp) - you could try checking if the submitted word is real or not instead of matching it to the word you originally scrambled.
Thanks for an amusing 10 minutes or so.