PBS
Pbs Nova Online: Lost at Sea the Search for Longitude
"The quest for a reliable method to find your way at sea was one of the thorniest problems of the 1700s." Find out about the search for longitude at this NOVA site. Includes interactive Shockwave game, learning activities and more.
New York Times
New York Times: Crossword Puzzle: Latitude & Longitude
Here is an interactive & printable crossword puzzle developed by the New York Times Learning Network. The theme of this puzzle is Latitude & Longitude.
Other
Boat Safe Kids: Longitude and Latitude
This website starts at the very beginning and explains how round globes are transferred to flat maps. Then they explain the use of longitude and latitude.