About two years ago I replaced my wooden and plastic cutting boards and cooking utensils (spoons, spatulas, etc.) with bamboo.
Bamboo is a renewable resource, as it can be re-harvested in about a tenth of the time as managed woods. With bamboo, the possibility of plastics' chemicals leaching into food (from nicks and scratches, plus cooking heat) is moot.
In addition, bamboo contains some inherent antimicrobial properties not found in wood or plastic. (That being said, hand-washing with warm, soapy water is still necessary.)
I've read good things about the Totally Bamboo brand, which is what I use. Cutting boards are fairly priced, and, if cared for properly, will last a long time.