If you consider yourself a geek, especially a space and sci-fi geek, you have to take a look at this collection of ISS Expedition Posters. They are awesome
The ISS captures amazing imagery of the Earth and it's all freely available online. I watched two videos, in particualr, that just blew my mind.
This is a striking view from the ISS. Two things stand out for me. The first is how many more stars you can see from space and the second is that bubble around our planet, out atmosphere.