Google maps is an excellent resource, because of the aerial and satellite imagery it provides. Unfortunately, the updates are rare. It took Fresno 4 years to get updates imagery (2005-2009) although in 2010 that was followed up with higher resolution aerial (angled) imagery.
One of the features google maps provides is a map of bike lanes. Google allows you to submit "problems" when the map is missing a lane or path that exists. However, I've found that the google employees only accept your input if they can verify it with the aerial imagery. Since the aerial imagery is now a year old, this is a problem when it comes to reporting new lanes.
Fortunately, google has launched a new tool for ANYONE to edit the maps.
It's called google map maker and it's available here
I've submitted some new paths, lets see if this time they accept them into the system.