goVFR is an online flight planning solution which uses Google Maps. The application provides worldwide navigation aids and airport data, worldwide weather forecasts and charts and many more functions relevant to help aviators.
goVFR is free to register and registered users can create and browse flight plans created with Google Maps. The flight plans include many options, such as adding waypoints, calculating a classic flight plan, real time fuel calculation and the ability to transfer flight plans to a GPS device.
If you need any help creating your flight plan or if you just want to chat and get advice from other pilots goVFR even has a forum.