Google earth trips

I recently taught an extensive unit on various animal habitats. I did use a lot of video from Discovery Streaming. I also spent hours scouring the web for interactive smartboard games. My searches were definitely fruitful - what I ended up with were many different approaches to exploring the different habitats - I am currently compiling an electronic resource list. What i found most effective were the virtual tours that paired photographs/videos of the habitats and interactive activities or games. Many of these resources also had sound, which really brought my students into these different worlds. My regret now - Why didn't I think to use Google Earth?! Google trips make so much sense and would be perfect paired with a science unit like this one.