OK, it's a bit more complicated than that, but not overly so. You have to have your business plan certified by an accountant, you have to have health insurance, oh ... and you have to be a US citizen because this treaty was designed to stimulate trade between the two countries. Also, you can't practice a "free profession" such as law or medicine; it must be an honest-to-goodness business.
|Spaarne River, Haarlem, Netherlands|
Photo by Bogdan Migulski
So if you have a solid business plan, particularly for any business which allows you to work from anywhere, pick up and move the Netherlands. Life is pretty good here!
Here's a more detailed explanation of the treaty requirements.
1. I'm rather suspicious of this number though. This article states that annual US family insurance premiums were over $13,000 back in 2009 and I know costs have risen since then.