The International space station has been a bright naked eye object from the UK regularly, moving quite slowly from west to east outshining all the stars visible. Timings vary of sightings but pre dawn and after dark passes are very common.
We managed to see the solar panels a few years ago through an 80mm refractor at just 50x magnification and the shuttle Atlantis could be seen in close proximity for a couple of days after.
There are many satellites visible to the naked eye, even the shuttle itself can be spotted but most move too fast to catch in a telescope. Many modern goto telescopes use a system that allows you to see them pass through by means of a countdown timer. To check sighting information in your location please visit the NASA website Click here