Yesterday I stumbled across the Heavens Above website. Once I put in my position, it indicated that last night was a good time to see the ISS. As the shuttle is currently docked, it should be especially visible.
At the indicated time, I went outside and gazed at the relevant bit of sky. First was a plane going in the wrong direction. Next I noticed what looked like a moving star. Hang on, there is another one coming behind it. This confused me, but I guessed this was either two planes, or the shuttle had already left the ISS and I could see both. The only way to know was to see if they would both disappear at the same point along the track where the ISS was due to full into the shadow of the earth. Right on que, both objects disappeared as expected.
For some reason, that was quite exciting. I have heard that you could see the ISS with the eye, but to actually do it myself was great, and seeing the shuttle at the same time was the icing on the cake.
Another pass is due tonight. If the sky is clear, I will try and grab a quick look.