The Global School House is an excellent source for project ideas. Join one or send in your own. The WebQuest page . Projects from all ages and curriculum areas. The internet can easily be used as a communication tool.
Students can connect with other classrooms in an email exchange.
This is a great way to begin to use the internet to do problem-based learning. Find a class that you could establish a keypal connection with. Find an individual student that may be an interesting keypal for one of your students. Search by country, language, age, or grade.