Chopping Mats

Many stone countertop customers have been happy with the plastic chopping mats (aka flexible cutting sheets) available at Bed, Bath & Beyond. You get two 12" X 15" sheets for about $4 and they last at least 6 months each. They sit on top of the granite or Silestone and allow you to chop without dulling your knives. Because they are made of a flexible plastic, they are not heavy like wood cutting boards and they make it easier to slide chopped ingredients into a pot. They can also be popped into the dishwasher for easy cleaning, but I find that warps them so I just hand wash.
Here is a link to the mats: http://www.bedbathandbeyond.com/product.asp?order_num=-1&wrn=-2092927711&SKU=11289967