I'm fixing to add these.
http://www.twistedthrottle.com/trade/productview/5144/669/I've already been one season with Poly Handle bar heaters ($40) - fantastic addition.
Blocking the wind at the coldest ends of the season will really cut down on the pain factor, and I'll remove for the sexy summer season. Pain is 15F - 25F - could use help there. Summer gloves in the 30's? could deal with that.
Gotta have the heaters, they are nice even on the 50F nite time rides (feel guilty but the hell with it).