bourdain's show is great, and i liked the one he had before even better - "a cook's tour." tony is an old school chef, i've worked for guys like that before in some pretty chaotic kitchens.
alton brown is good. not a chef, per se, but he's excellent at conveying basic cooking principles, and the how's and why's to home cooks.
and for the people who dont like bobby flay, but hate throwdown - you totally missed the point of that show. bobby flay is a cocky bastard, this show was all about taking him down a notch or two.
i still like iron chef, although i must admit i prefer the old japanses version. wish they still showed that late night. getting baked and watching them braise baby octopus eyes was always good fun at 2 in the morning.