Looks very cool, but it feels like there's a big gap between Evaluation (online only, low API call limit) and Enterprise ("contact us") pricing models. Not sure what market you're ultimately going for, but right now it seems to defeat the point of providing a nice simple API if it's only usable for either throwaway projects or by very large customers.
You make a great point, and we certainly don't want to exclude the in-between cases. We're still figuring out what those pricing tiers might look like, so if you've got an application that you're excited about, just let us know and we'll figure out a way to make it work!
Good to hear! Hope I can find some time to play with the evaluation version!