There's a part of me that watches videos like this and thinks, "boats have been successfully docked for thousands of years. We so don't need this." But then I watch the video and think, "Huh. Ok, I want one." "The simple, maintenance-free SlideMoor system secures a boat tightly to a sliding bumper with two lines on one side only to take the guesswork out of tying up a boat, eliminating many of the common docking and mooring problems encountered by boat owners. SlideMoor systems have been installed at docks in over 25 countries and can be used on lakes, rivers, bays, canals and most other waterways. The system accommodates power and sail boats up to 90 feet and well over 160,000 pounds." For more on SlideMoor, check out their site.