Back to the Future is a very good movie.
Dvorak is a lovely keboard layout, and a vast improvement over Qwerty.
Dasher is great fun, admittedly probably a lot better than Qwerty, and certainly much better than not being able to use a computer at all. However, I'm not to certain about Dasher in and of itself.
I will of course grant that it's both the best alphabetic interface I've ever seen (okay, it's the only real alphabetic interface I've seen), and vastly better than anything I think Icould have come up with.
In related news, except for the latter addition of some newline characters (to make my markdown work right), this post was writen entirely in Dasher, despite haveing to go back and fix some parts. Explaines the non-sequitor of an opening surprisingly well, doesn't it?
Oh, right. Dasher is a lovely little program that provides a number of alternatives to a traditional keboard. The most ~~notable~~ obvious is the one where you dynamically zoom in on the letters you want, eventually building up words and paragraphs until you have however, long a string of text you decide you want. It's not replacing my trusty Dvorak anytime soon, but it seems like a great alternative for people for whom typeing is not an option.