Actually, the best method used for cleaning wood is rinsing the board in chlorine. However, wood in general isn't recommended in the kitchen, due to the fact that it's so porous. It's now illegal to use wooden handled knives and wooden cutting boards in public food preparation. Consumer reports did a study that after using a wood cutting board for more than two months, it's safer to prepare the food on your toilet seat. All kinds of things absorb into wood; grease, bacteria, odor, rot, and just plain grossness.
But you're right, they do look good.
Your best bet is a polypropylene board