I sent my life science kids here to check out a more in depth look at organelles and their functions. A bonus is the great narrator voice. This website has a bunch of fun interactive cell activities, and links to some great videos as well.

Pretty cool demonstrations of the size of our solar system and universe with some fun little interactive "games." Also, amazing pics.

http://buoybay.noaa.gov/

This is a great site for many aspects of physical oceanography, estuarine/marine biology, marine chemistry, tides, winds, and meteorology. It would also have great significance when discussing things like water and air pollution and eutrophication.

You can get high res data on wind, water level, salinity, oxygen, etc etc and work on plotting and/or analyzing graphs. It makes it very easy to see any relationships - like temp and O2, for example.