Canon EOS 30D, Canon EF-S 10-22mm @ 10
1/15th @ f/7.1, ISO 500
I would have liked to have been a little higher in this shot, to get the person in the middle distance more separated from the steps. However, that would have required teetering on a wall 15 feet above the Thames, which I wasn't going to do.
In any case, what I like about this photo is the big foreground with the lines streaking across it. I was lucky to be able to recover enough detail in that area, although in the end it came out a little noisy for my absolute delight.