Cool aperture and shutter speed, etc. simulators for understanding how the camera works:
http://camerasim.com/apps/camera-simulator/
http://www.photonhead.com/simcam/
http://www.canonoutsideofauto.ca/
Basic Settings Stuff:
http://www.makeuseof.com/tag/the-basics-of-aperture-and-shutter-speeds-for-beginning-photographers/
Iphone, learn camera settings free apps:
http://www.makeuseof.com/tag/learn-exposure-settings-free-iphone-apps/
Really Awesome Camera Lens website simulator:
http://imaging.nikon.com/lineup/lens/simulator/