Drybike Weathershields are a concept similar to pogies, but they are a little smaller and lighter weight.
Carefully constructed from durable materials, these waterproof, breatheable, insulated covers offer superb comfort and warmth for your hands during inclement weather riding. The form allows for easy access to handlebars, brakes, and shifters. Not only do they keep your hands dry, but they block out the wind chill that ordinary gloves don't.
More features:
And at about $30 they are one of the less expensive options.
More info: Main site | Weathershields page