When Té Casan opened on West Broadway last year, we thought we had died and gone to heaven. Well, now we're off to a loftier aerie -- the new shoe department at Saks Fifth Avenue. While Té Casan boasted over 5,000 square feet of footwear -- everything from slides to sneakers -- the new Saks shoe department, on the entire eighth floor, boasts a cool 10,000 square feet, and more than 100,000 pairs of shoes. Be still our heart. (Maybe we're having déjà vu all over again, but somehow, we remember from our youth, an entire floor at Saks devoted to shoes.) O.K., you probably won't find the cutting-edge foot finery at Saks, as you would downtown at that Soho newcomer (or maybe not even so many name brands as at the warehouse-y DSW), but Saks' eighth floor can brag about something no other shoe department -- dare we say in America? -- has: its very own zip code. We are not kidding. It opens tomorrow, so get out your plastic and hie thee to Fifth and 50th for all the usual suspects (Chanel, Prada, Stuart Weitzman) and countless other brand names that may be new to you. Bring peds.