I really want someone to build this:

Using a webcam, monitor finger movements and find mistakes (using some sort of AI video analysis) to help user figure out how to improve. It's a hard thing to build but if you build it there is going to be paying customers. You can even sell hardware and subscriptions with it. Lots of schools want this!

Really pretty keyboard widget, though it did slightly confuse me that is showing the next key, not what I actually typed.

Cool! I found your solution a while ago while searching for something similar, do you plan to support other locales and/or keyboard layouts in the future?