1. Slideshow view or whatever you call it where you can press "next" or the right side of the image to go to the next screenshot. I hate clicking to "minimize the screenshot" then clicking again to zoom to the next screenshot

2. Maybe zoom in on that email message since it may give the impression you have to use a gmail account.

3. Page of features and screenshots

4. DEMO ACCOUNT WITHOUT SIGNING UP. No one likes signing up for anything unless they have to. Just have a static version or give them a demo account with full access and every hour or so, have the database be restored to normal