The Perch CMS has one of the best demos I've ever seen. They email you when your demo subdomain is set up (fast as lightning!), and it's fully functional, available for 24 hours, and does a great job of showing how this simple CMS works.
I like this "Check out the source code" link, and that it shows a version of the code that includes the Perchy PHP tags. I immediately understood the basics of how to integrate my own HTML/CSS templates with Perch. An example of the source code it displays appears below.
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