In my earlier reply, I did not bother to list things that are required by law in most areas. One item to single out is paddles. You should carry two (even if only one is required), and I highly recommend the ones that double as boat hooks and have telescoping handles. Here are two examples:

http://www.thechandleryonline.com/pr...oducts_id=7767

http://www.thechandleryonline.com/pr...oducts_id=6359

They can both push and pull. In addition to paddling water during an engine failure, their hook/push functions are very handy around the dock or trailer when other boats docked in your way, or during high winds.

The telescoping handles make it easy to keep them in any of the main storage areas.