I came across this app today, Bike Doctor. Its a neat idea, lots of people have no idea where to start if there is a mechanical issue with their bike. Bike Doctor App was built with the bare hands of Andreas Kambanis of London Cyclist Blog, Ron Forrester of Cychosis App and Ian Fuller of Cycle Hire App. They have the aim of crushing "the fear of bike maintenance and make it something anybody can do."
Its great because a lot of common problems
are easy to fix, and this app could save one an expensive stop at a
bike shop. And there is nothing like being independent on the road.