Looks great. The homepage is dead on: simple explanation of what it does, a live example, and a prominent signup button.

One issue to think through: companies would likely want to integrate the user management with their existing apps. That is, if a user is signed up for my web app, I'd like for them to have the same identity when on kroud. Sort of a federated authentication scheme. Likely not easy to do, but that'd be the major point preventing me from adopting kroud instead of hosting something ourselves.

Who did the design? I really like the simple and clean look.