My favourite bridge is Tower Bridge (the castle-y looking one near the Tower of London).
Millenium Bridge is not too bad, I like the sweeping motion of the "lines" of the bridge. (the side railings) Will trawl through my photo collection and look for one to convince you that it's not that bad!
Now that is a nice shot of a scene that many of us will probably never get a chance to see in our lives. Photography is still one of the best chances many of us will ever have for glimpses at things like this.