NOVA, from PBS, is a great resource for educators. One of their many educational resources includes an interactive multimedia experience for Exploring the Galapagos islands.

The activity launches in a separate window and starts with a satellite view of the islands' location. Then you zoom into the islands themselves and you can explore the animals and geology of the islands. There are also panoramic views and a section entitled "What Darwin Saw". This section follows Darwin's exploration of the islands, with his written accounts and an audio commentary from biologists.

The site is very well done and can be used in all levels of science classes.

NOVA Teachers site: http://www.pbs.org/wgbh/nova/teachers/