The International Space Station (ISS) is an internationally developed research facility that is being assembled in low Earth orbit. On-orbit construction of the station began in 1998 and is scheduled for completion by late 2011. The station is expected to remain in operation until at least 2015, and likely 2020. With a greater cross-sectional area than that of any previous space station, the ISS can be seen from Earth with the naked eye, and is by far the largest artificial satellite that has ever orbited Earth. The ISS serves as a research laboratory that has a microgravity environment in which crews conduct experiments in biology, chemistry, medicine, physiology and physics, as well as astronomical and meteorological observations.
Using the Heavens-Above website which provides information on the current passes when the ISS will be visible from any location. With this information it is possible to accurately work out where the ISS will pass over your location.
Photographing the ISS is pretty simple as it is very bright and a setting of iso 400 and an aperture of around f4 will capture the trail as the ISS moves across the cameras view.