Selfrescue video;
http://files.dnr.state.mn.us/educati...selfrescue.wmv
Wear a life vest under your winter gear.
Or wear one of the new flotation snowmobile suits. And it's a good idea to carry a pair of ice picks that may be home made or purchased from most well stocked sporting goods stores that cater to winter anglers. It's amazing how difficult it can be to pull yourself back onto the surface of unbroken but wet and slippery ice while wearing a snowmobile suit weighted down with 60 lbs of water. The ice picks really help pulling yourself back onto solid ice.
CAUTION: Do NOT wear a flotation device when traveling across the ice in an enclosed vehicle!