It seems to be MetaFilter Monday here on The Map Room. MetaFilter’s hidden jewel is Ask MetaFilter, where the MeFi hive mind answers questions posed by its members. Tag support just got added here, and there are already a few map questions. (Another place for your questions, if this here site doesn’t do it for you.)

Anyway, the most recent question asks whether there’s a single source for maps of major cities’ bike routes. The responses, while not being able to provide said single source — there’s a project for an enterprising sort — have at the least provided links to bike routes for a few cities. Worth a look.