Adventure learning projects are plentiful on the web. Your students can explore Antarctica, canoe the Amazon, or take part in a historical event. Most schools are at least beginning to develop a school web page. Get students involved with page creation and maintenance. Just make sure to have parents sign release forms before posting student's full names or pictures.
Every email account takes server space and maintenance.
When students move on, accounts have to be redone. These services provide an address, user id and password. Mail can be read, sent, or stored on personal pages on the web. When your student moves, they can keep the account or let it lapse. Create galleries of student art and writing.