We Choose the Moon

Far and away the best website about space exploration that I've ever seen, The Kennedy Presidential Library's WeChooseTheMoon.org is a stunning interactive recreation of the Apollo 11 moon landing. It seamlessly combines digital recreations of the flight with authentic audio and video and footage to create the complete experience.

A Periodic Table of Visual Elements

VisualLiteracy.org hosts a cleverly designed list of graphic organizers modeled on the Periodic Table of Elements. Mousing over each organizer type brings up an image of the organizer. It's a good starting point if you don't know what you're looking for specifically, but you'll have to look elsewhere for blank templates to customize for classroom use.