I bet even Alton Brown has more than he'll admit to. Here are a few of mine-
I use the heck out of my cherry pitter during cherry season. I had a funky one and then I saw one that was heftier and more ergonomic-looking so I got it. Now I have two, because I don't want to just throw the old one away- I'll yard-sale it eventually or something.
Vinturi- because it turns cheap wine into drinkable wine a lot of the time (I'm not a connoisseur of wine in general, obviously- just a fan)
Octodog- I've never used it but it cracks me up every time I see it in the cupboard