I'm working on www.seeflo.com
It still has some glitches but the start of the application is there.
My biggest problem right now is finding my audience.
Highlightjs was included in my main javascript, while I only need it for the instructions to highlight some html/js/ruby/php. It's a whopping 100kb by itself.
I moved this to the instructions page, and I'm using cloudfront now as a CDN.