Essay Map - http://www.readwritethink.org/files/resources/interactives/essaymap/
Wordles - http://www.wordle.net/
Puzzlemaker - http://puzzlemaker.discoveryeducation.com/
Online Field Trips - http://www.beavton.k12.or.us/ed_links/ms/internet/fieldtrips.html
So Much of Everything! - http://www.abcya.com/fourth_grade_computers.htm