I purchased the 11' long Landing Loop last summer (~$79). Simple technology that enables one person to get a line around a dock cleat or piling from the 6.5' high deck on our catamaran. Our marina was usually unattended when we returned so this was invaluable.

It takes just a few minutes of practice at the dock for the assigned crew member to figure it out before heading out.

http://www.landingloop.com/