You can really create just about any type of application in a public folder. Applications I've seen over the past few years include some of the following:
Moderated or unmoderated message boards
Sales force automation systems
Inventory management applications
Customer relationship management applications
Information distribution systems
Help desk systems
Basically, if your system needs to store information and have others access that information, you can turn your system into a public folder application. So, how do you tell whether your potential application is right for a public folder application? Well, there's no real litmus test for whether your application should be developed using public folders, but consider ...