The Guardian environment bloggers have created a Flickr page in conjunction with Warrington Cycle Campaign (famous for its 'Facility of the Month' web pages and 'Crap Cycle Lanes' book).
You can either add your own, or just glance through the selection that other people have posted. You won't know whether to laugh or cry.
Take action: Cycle Hire in South London
Oxford Street - what about cycling?
London success vital to new DfT Cycling and Walking Investment Strategy