So far, the only feedback I can think of is that perhaps you should think of a better name, just to make it easy to recommend to people. I don't know how to even say Iorad (I'm guessing it's an anagram of radio).
How much are you charging for this?
Once out of beta, we will do freemium. Maybe charge between $20-$40/month to download doc, ppt, web version and customize logo.
PDF instruction and hosted course (with iorad logo) will be free
Captivate is great for power users but we are looking for domain guys that want to create robust instructions without copy/pasting screenshots.
Since the cost of hosting a non-paying user is actually pretty small (particularly because these aren't videos -- they're screenshots), if you have a non-paying user who embeds their useful walkthrough in a very visible location... well, that's pretty damned valuable free advertising. They've more than "paid" for the service, and you really want them to have a good feeling from the transaction, not shame them -- if they feel good about using the walkthroughs, they'll use them more, and not only evangelize but also find themselves needing the paid features... and be happy to pay for them, not forced against their will.
Actual freeloaders (people who are only using the free service in low-traffic places, or only internally) cost you almost nothing to host, so it's not smart to obsess about them.
The trick instead is to draw the right line between free and premium, and also work out how to structure pricing to account for many different kinds of uses.