If you are planning on training and racing either a ½ or full marathon this fall, you should check out Ryan Hall's videos from Master Shift. I went through all of the videos and found some good insights and suggestions.
Ryan also provides a sample marathon plan which is based on a 16 week program. The plan is designed more for new runners than experienced runners, but it is always helpful to see how other people put together their training plans. Sometimes, new ideas and workouts are discovered that you might want to incorporate into your own training plan.