"Here's a suggestion: Let's start using the terms 'prototype' and 'mockup' to mean different things. In my opinion, they talk about different ends of the problem....."
This is a really sleek looking top-layer framework specific for mobile touch interaction. The Art of Manliness just launched their new website, I suggest visiting http://artofmanliness.com on both your desktop and iPad to see the difference.
An alternative to reCAPTCHA...still not perfect. It could trip up someone with cognitive disabilities..or pretty much anyone having an off day. But perhaps it's better than asking a blind user to remember an 8 digit sequence with JAWS talking over the recording and having to repeatedly enter/exit forms mode? It could be edited to include an easier sequence which would make it even more accessible for everyone except spambots.