This guy is a hacker in the truest sense, I read a blog post over a year ago about him tinkering away on this. It didn't seem he'd take it this far. It's a great achievement and I'm glad he's been insightful enough to keep it free.
I used Impact two years ago on something and I was so impressed with the API simplicity and power (not to mention the fact that it ran very well). This guy does great work.
Dominic is amazing at what he does. ImpactJS is such a powerful but simple tool. I love that every release is NOT bloatware, but carefully thought out feature enhacements.
