Quite honestly, I don't get it. Why would anyone want their product to depend on a third party (= point of failure) for something as trivial as storing a string in a database and calling a markdown processor?
After subscribing, I get redirected to <a href="http://www.healthtracr.com/" rel="nofollow">http://www.healthtracr.com/</a>. Another project of yours?
I actually rather like it. I had a similar idea a year or two ago which became something more like a text snippet site, but I originally had ambitions along these lines.