Ask HN: Review my weekend project, testist.com

Backstory: About a year ago I started searching for a service that made creating custom tests easy and had some useful features (API, email results, etc). After looking for a long time, I could only come up with one -- Zoho Challenge. After working with that for about a year, its been nothing but headaches, broken functionality and customer service problems. Fast forward to present. I need a project to help me learn Rails (better late than never?). So, I decided to build something I know I would use -- a better online test service. I'm trying to build out the functionality I want to see in a form that others could use.

What it is (or will be): A better version of Zoho Challenge, initially more oriented towards developers. Or, perhaps a good description would be Wufoo for tests/quizzes/exams. Basically, a service built to create, host, and integrate online tests easily into whatever you're doing so that you don't have to code something up yourself.

Link: http://testist.com

Its a weekend project in which I was learning along the way, so its a little bare-bones. Other than that, any thoughts? Would you use it if it were more fully featured? Etc..? Right now I'm aiming for the features I want (since I'm my first customer) and things are kind of simple, but I'm aiming for more complex features in the future to touch upon a more academic level of service.