As the Olympics get underway, fans have a lot of options to engage online. Many popular sites on the web are involved in a variety of ways.
Google allows you to take a virtual tour of the Olympics in 3D. They recently released updates in Google Earth's 3D Buildings layer, which showcase Olympic venues (54 buildings). Models range from downtown event centers to ski lifts and spectator bleachers. The Official site for the Olympics uses the models itself.
Vectoral Elevation has "an interactive artwork" that allows users to direct light beams and transform Vancouver's skyline until the end of the month using a custom interface built on Google Earth and Map APIs. It lets users design big light sculptures by directing 20 robotic searchlights located around English Bay.