http://www.quickbrownfrog.com
http://quickbrownfrog.wordpress.com
It's at the MVP stage, and while a technical success (I think it's an awesome in-browser app), no one seems to be interested in paying for it. I reduced the price to $10 prior to launch, and I still haven't had a nibble. I burned through about $200 in Adwords/Bing/Facebook ads so far. I guess it's hard to compete with the many free typing tutors out there.Still, I plan to keep plugging at it. I have no aesthetic sensibility whatsoever, so next on my list is to get some badly-needed design help.
Many thanks to everyone who provided invaluable feedback during the past month. I really learned a lot and had great fun developing it.