SurfYourWork!
Here's an interesting article from eSchool News Online
For class credit, a Canadian high school student has created a web-based homework management system that allows students to hand-in assignments electronically. He now is offering the service to schools across North America at no charge. The service, called SurfYourWork.Com allows teachers to assign homework to individual students. Teachers can even attach files, such as PDFs or Microsoft Word documents, to each homework assignment, providing students with continuous access to resources online and saving schools unnecessary printing costs.
Worth a look - especially for the interface design!