Optics
Specifically for Mr. Calderone, a link to a beautiful site:http://www.atoptics.co.uk/
It explains a lot of athmospheric and optic phenomena, including nice pictures. Including Rays&Shadows, Water Droplets, Rainbows, Ice Halos, and the High Athmosphere.
Also, for more like these, check out http://www.polarimage.fi/.
Last but not least, I used to visit http://antwrp.gsfc.nasa.gov/apod/ daily. It has a single new astronomical picture for each day, with a short description and loads of links to in-depth information.
