Websites
Human Population Calculator
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A nifty calculator to satisfy all your curiosities about the human population. You could even play a rousing game of Where's Waldo? while on the site. (You won't find him; although we did see his blue-stripe-shirted cousin.)
An Ecology-Related List
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A list of pretty much every big ecology resource out there on the interwebs. It's ginormous.
The Ecological Society of America
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Find out what ecologists do in their free time (hint: they visit this website).
The Earth on Edge
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The Earth on Edge, from PBS. They have tons of info on the different ecosystems, plus an interactive quiz (since we know how much you love those).
Video
Planet Earth
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Documentary clips from Planet Earth. You have no idea how much we love this show. We've almost worn out our copy on DVD.