I know it's already been posted, but I love the millenium bridge in London (my pictures).
Ignore the people in this picture. I don't know who they are, they just got in the way of the picture and I didn't realize it until later in the day
And a couple of cool pedestrian bridges across the 60 in Phoenix. These are from google maps (obviously), but I ride my bike across them pretty regularly, I'll get some real pictures next time.
College and the 60
Country Club and the 60. My fiance and I call this the DNA bridge