Some good info has been provided so far.
Besides the toxicity of some woods, the fine dust caused by some
woods, like padauk, should also be avoided.
I've made several cutting boards myself over the past few years, with my most common materials being hard maple, walnut, cherry and
Try mixing the species for some very nice contrasting results.
Also make sure you use a waterproof glue, such as Titebond II or something similiar.
Finally, I normally finish mine w/butcher block oil which should be re-applied on a regular basis, based on usage.