Various Olympics Sites ~ I have explored these sites and can personally vouch for them.
US Olympic Team: http://www.usolympicteam.com
Torino Kids Village: http://www.kidsvillage.torino2006.org/
Torino Kids Village Educational Resources: http://www.kidsvillage.torino2006.org/istituzionale/Interna.asp?idarea=38
Kristin King: http://www.nbcolympics.com/athletes/5080152/detail.html
NBC Olympic site: http://www.nbcolympics.com
The Official Website of the Olympic Movement: http://www.olympic.org/uk/index_uk.asp
Torino Official Site: http://www.torino2006.org/ENG/OlympicGames/home/index.html
Olympics Education (good for kids & has lesson plans): http://www.uen.org/2002
Olympic Committee site: http://www.olympic.org
Amateur Athletes of Los Angeles (good lessons in the curriculum section): http://www.aafla.org/6oic/over_frmst.htm The Olympic Games in the Ancient Hellenic World: http://minbar.cs.dartmouth.edu/greecom/olympics/

More Olympics Sites ~ These sites are ones that I have not explored. Please view them personally before allowing your students to access them.
The Olympic Games: http://library.thinkquest.org/27528/main.htm
Ancient Greece: http://www.ancientgreece.com/
Winter Olympic Events: http://www2.lhric.org/pocantico/olympics/winterolympics2.htm
A Tour of Ancient Olympia: http://www.perseus.tufts.edu/Olympics/site.html
Ancient Olympic Events: http://www.perseus.tufts.edu/Olympics/sports.html
The Real Story of the Ancient Olympic Games: http://www.museum.upenn.edu/new/olympics/olympicorigins.shtml
The Hellenic Museum: http://www.hellenicmuseum.org/exhibits/ancientgrk/olympics.html
Easynet Olympic Education pack: http://www.easynet.net/teamgb/education/
The Olympics: http://webtech.kennesaw.edu/jcheek3/olympics.html
The Olympic Games of Ancient Greece: http://education.nmsu.edu/webquest/wq/olympics/olympicwq.html
Resources for Canadian Educators: http://olympicstudies.uab.es/eng/obs_rec.asp?id_categoria=7&id_subcategoria=20
Teacher Planet Olympic Resources: http://www.teacherplanet.com/resource/summerolympics.php
Info Please: http://www.infoplease.com/spot/winter-olympics.html

Olympics WebQuests
These webquests focus on the Olympic Games.
SALT LAKE CITY OLYMPIC TREASURE HUNT
http://www2.lhric.org/pocantico/olympics/saltlake.htm
How much does it cost to attend the Olympic medal ceremony? What are the mascots for Salt Lake City? And how long is the Olympic torch? After answering the questions on the 2002 Olympic Games on this treasure hunt, let student teams use the accompanying sites to create their own questions for classmates.

OLYMPIC GOLD
http://www.arlington.k12.va.us/schools/barrett/webquest/olympic/index.html
Taking a different approach, students must devise a fitness and nutrition regimen to compete as athletes in up- coming Olympic Games (this webquest was addressed to the 2000 Olympic games and therefore to the summer Olympics and its corresponding sports events--adapt the webquest accordingly for the Winter Olympics--see resources, above). Both journals and written essays are required.

ANCIENT OLYMPIC TREASURE HUNT
http://www2.lhric.org/pocantico/olympics/ancienthunt.htm
Tighten your togas and head on in to this webquest, back in time to explore the ancient Olympic games. Students will respond to a set of eleven guided questions; again, use the resources above for site research.