There's a TFL online cycling route planner now (here) and the London bike hire scheme launches this week, so it is all action on the two wheeler front.
Cardiff as ever appears to be in the lead though, if more modest, with bikes available as near to Bronwydd Avenue as Roath Park Rec.
From the nothing new under the sun department I recommend this 1936 Pathe News cycling tips film:
Evelyn Hamilton, women's professional cycling champion gives cycling tips - covering fashion and safety. M/S of Evelyn having her legs massaged. She stands up and stretches her arms. She is wearing a revealing bikini.
Various shots of Evelyn cycling down road on racing bike. She wears natty beret and plus fours trousers ........