Probably mentioned upthread, but I can't speak highly enough of cutting boards by The Boardsmith. All made in a workshop by one guy who's a pleasure to deal with, does great work, and has seriously researched the topic. And he undercharges. I've had a 16x22 maple end grain board of his for eight years or so, and it's nicer than new. Hasn't yet needed sanding (although I cut with a light touch and don't use my serrated bread knife on it).
All his boards have rubber feet on the bottom, which is such a good idea I've applied it to my other wooden boards. The feet prevent slipping, and more importantly, keep moisture from accumulating under the board. This is the classic cause of boards warping and developing a concave surface.
