Emily, thanks for this! I have 12x10" of counter space in my new place - seriously. That's twelve by ten inches. I had no idea these things existed - you just improved my kitchen experience by about a thousand percent :)

I've been considering getting something like this. Thanks for the post. I have a Crate and Barrel gift card to use so this is perfect, I love the collapsible strainer on the C&B one.

We have a large one of these (http://www.epicureancs.com/store/products.php?category_id=1). It fits perfectly across one side of our double sink. I don't really like to use it there - it sounds all hollow and weird when I'm chopping - but if I'm a little short on space I do. They're nice boards, too; gentle for your knife and dishwasher safe.

these are awesome and I WANT.

Do you know of anything that is made to sit on top of a stove for added room? I have a full-size stove in my little studio kitchen and a lot of the time I am using the sink for other things but my 12 x 12 counter space is not enough.

Domestic Intellectual, many years ago, I had some large rectangular burner covers (painted metal) that fit over 2 burners--I think I got them at a local hardware store. They were large enough to make it really easy to balance a cutting board over the stove. Since they were metal, I did have to be a little careful about putting them over hot burners. A web search for "rectangular stove burner covers" turns up a bunch of much prettier versions (mine were plain black and got beat up quickly in all the moving I did then).

Oh, and I have something very like the Martha Stuart one (might be a knock off). Very useful, but be aware that the collapsible colander really collapses--it almost useless outside of the cutting board because you can't put it down with something in it--I had radishes all over the place once!

I use it without the colander more often, with a bowl underneath the hole (in the sink) for scraps.

@Domestic Intellectual, a few options were mentioned in this post.

Ikea has one that I really like: http://www.ikea.com/us/en/catalog/products/70117921

I looked and looked for just the right cutting board that I could put over my sink, but I needed the dimensions to be just so, and couldn't find a cutting board that would exactly work. Finally I found a company that sells custom-cut cutting boards (thought they point out you can cut them with a circular saw, too) and you pay by the square inch (cost is pretty much the same price range as most retail cutting boards).

http://www.cuttingboardcompany.com/

I got exactly the dimensions I wanted, and then bought some of those little rubber raised-dot adhesives to stick to the back for stability. Love it.