Guy Stevens is using Udemy, a web based service offering real life instruction with thousands of courses, as a vehicle for delivering a 6 hour course on designing a complete FileMaker invoicing system. The cost of the course is $25, and instruction is broken into smaller segments similar for easier understanding.
Check out the details at the link below (a video explaining the course) or directly at this link.
He has 15 students enrolled at the moment. It will be interesting to see how well this approach works.