Some pretty good advice so far...
Here's my 2 cents worth: the village of Lake Louise is dead quiet - no night life. Unless you are staying at the CLL like Montana Horn you are probably better off in Banff.
Hotels are about 1/3 the price of the summer season. High end suggestions: Banff Springs; Rimrock (by the Sulpher Mtn. hot springs; best rooms in Banff) - both of these are away from the main part of town. Mid to upper end: Banff Park Lodge, very short walk to the main part of downtown; the condos on Tunnel Mtn are good as is the Banff Centre (great exercise facilities). Mid - level: Banff Caribou Lodge, has a Keg Restaurant that has v. good b'fast. Lower end (but still okay): Banff Voyageur Hotel, has a little pub plus on site liquor store.
"feallen" posted the Ski Banff Louise site address - these are the folks to deal with with out a doubt. Better pricing than booking directly with the hotels usually.
Mt. Norquay is very close to town, has pretty good snow making, no crowds, and sells skiing by the hour!
Don't drink and drive. The Banff and Lake Louise RCMP are very much on the look out for impaired drivers. Catch a cab or the bus instead.