Try these tools from NASA, specifically the J-Pass tool:
science.nasa.gov...
It will help determine if that light you saw really was a satellite. Those tools obviously don't have ALL the satellites in them, but they will
point out a great number of them that may be flying overhead at the time.
Check out the J-Track 3D tool. Turn on all satellites and you will see just how crowded it is up there.
edit- I forgot to mention to be patient with the J-Track 3D tool. It takes a while to load the orbit data for 500 satellites. You may even have to
close and reopen the site to get it to load. Depends on how busy the servers are.
[edit on 7/22/2004 by RivyBeAsT]