To follow up, there are communities on the internet that share satellite information.

How much danger is the space shuttle in regarding the debris that orbits the earth? Will there be a point where it will be too dangerous to launch humans into space because of the clutter or will there always be enough space out there to get through?

I've read (in Wired) that private citizens have been profiled for tracking satellites in the sky. Basically they can't be hidden and people like Osama bin Landin can literally hide from spy satellites.

Caitlin,
If you look at the Nasa link above and select the "Satellites" menu option, you can view only amateur satellites.
A

What about space junk, are our satellites safe?

Is anyone with the money to do so allowed to launch a satellite? Is there some sort of national/international regulation committee to keep them organized up there?

This is a great real time link, java, to satellite orbits:
http://science.nasa.gov/Realtime/jtrack/3d/JTrack3d.html

also there is a noteworthy satellite post at slashdot today:
http://science.slashdot.org/science/08/09/05/1231228.shtml

most geo sats are "parked" by the Equator

if most satellites are geosynchronous, why can I see satellites moving across the night sky? I would think they would seem to stay in the same place ...in which case I wouldnt notice them.