We have been enjoying going out and looking for it when the sky is clear enough.
It is amazing to watch with the naked eye - no telescope needed, and is fairly unmistakable. It moves quickly, but is usually visible for about 5 minutes.
You can check the NASA website for when it is visible where you are at
http://spaceflight.nasa.gov/realdata/sightings/index.html .
http://spaceflight.nasa.gov/realdata/sightings/index.html .
The shuttle is flying with it right now, too.