Historypin is a great site that I just came across. It allows you to "pin" old photographs with a short story of the event to a Google Map. Anyone can search by location and time. The application is great for a classroom project on local history, especially because this site is new and still relatively few pins.
Did you know that on average teaches spend $600 a year on necessary school supplies for students. Through "Adopt a Classroom" you can make a donation to help provide classroom materials for students. This link specifically helps students in East Providence, RI. These funds are given directly to teachers for use in their classrooms.