Who needs trailers? You can keep a sail boat in the trunk of your Honda, as long as it's the MiniCat ($4950). This fully collapsible and extremely portable 2-person catamaran weighs only 80 lbs. but can support 500 lbs. of weight. It features a fiberglass and aluminium frame, inflatable twin floats, and other sailing necessities. The MiniCat can be assembled in around 30-minutes, so you'll be on the water playing pirates before you know it.
Convert your bicycle from man-power to horsepower with the RevoPower ($600; 2008). The wheel, which weighs in at under 15 pounds and is designed to fit most bikes, contains a 21cc motor that gets over 100mpg and goes around 17mph. A simple way to power up your commute. [Thanks. Cliff]