Check out the StartupVisa and this post from Brad Feld and friends. They are attempting to modify an existing Visa to be more conducive to foreign entreprenures starting businesses in the US.
The concept makes sense, and it seems like they are putting together a simple and thoughtout structure for managing the program. It's great to see some great business leaders putting together a government program that makes sense. This really is the "American Dream" at work. And what a better way to stimulate innovation and business growth in the US.
Good work StartupVisa team. Let us know how we can help.