June 2022 NOTE: The Stuff in Space website seems to have gone away.
Stuff in Space is a “real-time 3D map of objects in earth’s orbit”, including satellites and debris. This map uses data from Space-Track.org, a website operated by the U.S. Department of Defense. On this map, different kinds of “stuff in space” are color-coded: red for satellites, blue for rocket bodies, and grey for debris. Visitors may also explore different groups of space objects, which include maps of all Global Positioning System (GPS) satellites and their orbits and a map of the debris created by the 2009 collision of the satellites Iridium 33 and Kosmos 2251. Check it out!
SoCalGIS.org 
Hello from Colorado,
You mention the website Stuffin.space and I’ve been using it as a great learning resource for a few years now.
Their site seems to be down as of May and hasn’t come back.
Do you have any idea what happened to it, where they may have moved to and if anyone else has a similar site?
Any help would be swell.
All the best!
Sincerely,
– Keith
Keith.D.Blodgett@gmail.com
Colorado Springs, CO, USA
Looks like stuffin.space has been claimed by a squatter or wasn’t renewed. Too bad, it was a great resource when I’d see a satellite overhead to help identify it.