I agree. I was looking for a demo as well. A suggestion I have is to include a few screenshots on the landing page - perhaps incorporate them with the features list.
Normally I would do a video and spend some more time on the marketing page but I thought I'd put together "something" before sending it out. I had no idea so many people would be checking it out. There are some examples on my blog http://jeff.io so I think what I'll do now is bring in the screenshots into the landing page.