Here is a link to a CBC-TV (Canada) show about buying and figuring out wines. Here's a link:
Wine Confidential. Interesting show.
EDIT: Just watched the whole thing - 45 minutes. Good stuff: California, Bordeaux, Niagara Peninsula, sommeliers, celebrities, tastes, cork vs screw cap, Parker, Sideways, Judgment in Paris, 2 Buck Chuck, collecting. Worth watching!