This new program runs through a ton of ways in which developers can (and should) make their games more accessible to the over 33 million disabled gamers out there. Everything is covered: obvious things like a colorblind mode and remappable keys to not-so-obvious concepts such as speed settings and key macros. On a related note, Terry Cavanagh's VVVVVV is one of the most accessible games I've ever played, believe it or not!
The website itself is wonderful and easy to navigate, but if you want a more in-depth look into the world of Includification, check out this here .PDF. I really hope that this helps developers finally realize that it doesn't take very much in order to cater to a huge demographic.