The mechanic at MD Boats in Indianapolis gave me pretty much the same scoop on winterizing as what Finner heard, with a couple exceptions:
1) Mix Sta-bil with the fuel in a full fuel tank, per the directions on the bottle (this is recommended in the Epic owner's manual.
2) Make sure you bring the engine up to operating temperature, and run if for a couple of minutes (with your garden hose connected to fresh water, otherwise you'll destroy the raw water impeller, and create hot spots that could crack the block once you introduce the cold antifreeze) before you take off the hose--this will ensure that the thermostat is open and you get antifreeze throughout the entire engine. If you don't do this you run the risk of a cracked block(even though I am told Toyota insists they froze an unwinterize engine and the block did not crack.
3) Be friendly to the environment and use non-toxic antifreeze.

4) Make sure if you are up north where it gets REAL COLD that you follow the mixture directions on the antifreeze bottle so that you get maximum protection.
5) I am told that if you use the foggin oil that comes in a spray can that you can spray it into your intake horn at the fron of the engine, and it will not only coat the cylinders, but will take care of the entire intake system as well (I'd be interested in feedback on this one, since the only thing that goes through our intake systems is air, being that we have multiport fuel injection directly into the cylinders)
6) The toyota owner's manual suggests changing the oil in the fall is the way to go so that any water present in the oil will be eliminated, reducing the chance of internal rust during the off-season.
A lot of other good stuff in the owners manual about pre-storage care...
Pete