I really like it. As soon as I started using it, it was clear how to do anything. My suggestion would be to change the sample links on the home page to images. Also, it would be nice to try a demo before signing up.
I'd be tempted to move them below the fold - let the user read that memobuild will give them drag and drop page organisation and collaborative document creation before they click through and start wondering what your app's connection with biometric testing in Australia is
A "sample built using memobuild" bar at the top with a link to the home page would seem pretty essential too for exactly the same reason.