A lot of folks getting into Mach-II download the sample application I have provided and a common question is "What is the userService.cfc for?". I'm long overdue to write an article about the sample code (and unfortunately that is not going to change in the short term) but I did want to address that question.

As I was getting further into Mach-II development I wanted to come up with an architecture that would support a Flash/RIA interface (in addition to an HTML interface). The 4-tier approach using the service layer was the result. A blog post from Matt Liotta was the inspiration for this. It's a good read even if you're not implementing an RIA right now. You can read the article here.