Tonight the Shuttle and the ISS will be visible as separate objects passing overhead.

The shuttle will be first, followed by the ISS one minute later.

Both will come out of the west, the shuttle at 08:46 followed by the ISS at 8:47 PT.

They will both appear about 27-31 degrees from the horizon. THe easiest way to find them is to make a fist and hold it at arm's length.
Put the bottom of your fist (pinky) on the horizon-your fist is about 10 degrees worth of arc- three stacked fists, from the horizon is about 30 degrees!

Good luck!