Stones are not just for pizza. Many people call the Large Round Stone or the Classic Round Stone the "pizza stone", just because for most people, that's what they first think to use it for.
You can use a stone for anything you make in a glass or metal pan. If you have the "pizza stone", you can do cookies, fish sticks, tater tots, french fries, cookie pizzas, etc. There's more to it than just pizza.
With the round stones and the rectangle stone, they are flat, but you can get a rack that you place the stone on that makes it easy to take in and out of the oven. It has handles and works quite well. A poster above talked about using it upside down for serving or display. That works well too.
Check out the whole stoneware line. There are tons of shapes and sizes to choose from; I am sure we all can find one shape and size that we use a lot in the kitchen to try out.
My personal favorite stone is the Stoneware Bar Pan. It is SO multi-purpose. Not only will it do bars, but chicken breasts, pork chops, crescent rolls, fish sticks, tater tots, cookies, jelly roll type cakes. You have appetizers, main dishes and desserts covered with that one pan. Not that the others can't do some of this stuff..it's just my favorite.
By the way...the tool that chops food...it is called the Food Chopper.
As far as must have's in the kitchen...everyone covered a lot of the basics. It just depends on what your needs are and what you are looking for. I know A LOT of people who have gone wild over the new Striped Simple Additions pieces that are multi-colored. Oh, and the new Roasting Pan with the lifetime warranty...lots of interest there. It will hold up to a 20lb turkey, but you can also use it to make the gravy because the drippings stay in the pan (meat rests on a rack) and you can also bake something like Baked Lasagna. Like I said, it just depends on what your needs are.
They do have their whole product line on their website. Check it all out.