BoatU.S. article on Inspecting your Mast and Rigging.
BoatU.S. Rigging Checklist
How to Keep Your Jib Furler Alive, by Brian Toss
Below the surface of the water lives an environment that can be tough on a boat and its metal parts and fittings. Inspect and service these parts when the boat is out of the water, and perform visual inspections when cleaning or swimming on the bottom of your boat. Check all zincs annually, if half (or more) of a zinc has been lost to corrosion, replace it.
Sacrificial Anodes, by Don Casey
Inspect your propeller for any growth or visual damage. This will help improve performance and help maintain the value of your investment.