Hi.. I just discovered Highslide this morning and have been playing with it. It looks great, and seems to work great. I am at the very early stages of a startup that will hopefully go commercial (when, I don't quite know yet.)
We (my 3-man team) are building our first interactive prototype to test with select nonpaying users. Likely throw-away code as we learn more about our potential customers. I'm wondering if our prototyping phase falls under non-commercial use.
Of course, I would be very happy to pay for a commercial license the closer I get to launching something.