The following links are the most valuable resources I have found for patent related information.
Patents
Published Apps
Public PAIR
View/Pay Maintenance Fees
Assignments
Assignment Search Help
Fees
Historical
Scam Prevention
Inventor Resources
EPO (European Patent Office Searching)
Quick Search
Advanced Search
Number Search
Classification Search
Free PDF Copies of US patents/applications
Google’s Patent Search
Asistri Search
Inventor Notebooks
National Inventor’s Hall of Fame
Professional Inventor’s Alliance
Gallery of Obscure Patents
Gallery of Historic Patents
US Copyright Office