SAVAGE SEAS http://www.pbs.org/wnet/savageseas/
This companion site to the new PBS series offers a collection of informative pieces and activities centered around the world's oceans. The site is divided into four principal sections, each of which features an article, brief sidebars, video clips, and in some cases, animations.
Sonia's Oceanographic Lessons http://www.botos.com/marine/
Familiarize yourself with the Antarctic marine ecosystem, hydrothermal vent communities and eelgrass habitats. The site contains lesson information, resource links, a student activity, and a self grading test with detailed answer sheet and remedial links, to help students assess their knowledge.
Sounding Out the Ocean's Secrets http://www.beyonddiscovery.org/
About the applications of underwater acoustics in ocean research. Researchers today apply their knowledge of how sound travels through water to carry out a myriad of tasks such as detecting underwater eruptions, measuring ocean temperature, and monitoring marine mammals behavior.