I wonder if you might want to include some "below the fold" stuff in the demo, or maybe as its wrapup, that gives me a hint of what else I could do, even if it's not in the demo. I.e. "we won't show you here, but you can also create fancy reports..."?
I'm also planning on producing some good content (articles and screencasts) on what you can do with mindmapping both in general, and with ThoughtMuse specifically.