all the fancy schmancy TV chefs love the unsalted butter. Their reasoning? you get to control the amount of salt in your dish better. Makes little sense to me (one just allows for the salt in the butter!) and I suspect it's an in-group thing...be cool and do what the great chefs do, it's the in-thing this decade.

Since unsalted butter does not move off the shelves as quickly, I suspect the salted stuff is fresher.