R.J.
We've been using the computer for educational stuff since kiddo was 2.5.
Websites:
www.starfall.com
www.pbskids.org
http://earth.google.com/
http://kids.discovery.com/
http://kids.nationalgeographic.com/
http://pbskids.org/cyberchase/
CDR games
- Cluefinders
- Carmen San Diego
- Caesar iii / Caesar iv
Also most top notch museums (British Museum, Smithsonian, Met, Louvre, etc.) Have virtual tours. As do many archeological sites. :) :) :)
R