wow it's great to see the mockup space seeing some real innovtion and competition. I've had my own head down for the last six months working on my own mockup software and I agree that HTML5 is the way to go. Being able to demo a design on a mobile device is a killer feature. Also it's so heartening to see such a robust and enthusiastic response from the HN crowd... makes me feel just that little bit more confident that mockup software is a good category to be targeting.

All the best. I look forward to seeing what else you lot come up with :)