How about a fold down work table in the garage to keep space free when needed? Although, let's be honest, how often would a work table be clear enough to actually fold down?
PVC Garage Organizers...great idea for the garage!
http://www.woodesigner.net provides excellent guidance as well as tips to woodworking
Roll around lumber cart plans
Wall Mounted Tool Cabinet - Bing Images
Air Compressor Cart... make this but bigger for storage and easy access.
Garage storage ideas
Under sink storage
under sink cabinet storage. yes please
How to build storage above garage door