Let me get this straight: you spent a few hours last week to build an app, and it already generated $100K of business? Did I miss something in that story?
NotaryCRM users are tracking $100K of their money in my system.
Subtle, but important difference. :)
Given your profile, I feel a little weird giving 'advice'; did both of those companies happen in the last 18 months?
Regarding NotaryCRM, I'd start by fixing the layout so that it renders properly in Safari; the signup button requires a horizontal scroll for me.
Don't sweat AJAX too much; it's a useful tool in the toolbox, but a lot of people go nuts on making everything load dynamically, which gets irritating really quickly.
Your contact page is a form; I don't know about other people, but this always puts me off a bit.
Great feedback, I'll add this to my list!