Hi there Kitchenelf and Kendall.
Let me respond to each of your points. I've done a LOT of research on the subject, so let me share the wealth:
1) Are wood cutting boards safe? YES! I have found many many many studies and reports, including FDA reports, that show that wood cutting surfaces are at least as safe, and in many cases safer than plastic surfaces with regards to bacteria. Wood grain structure provides a natural defense against bacterial contamination. Some studies specifically say that end-grain constructed boards provide better bacteria protection, others don't distinguish. Of course, proper cleaning is by far the most important factor regardless if its wood, plastic, glass, etc.
2) As long as the board is maple? Maple is TRADITIONALLY used for cutting boards because it is a SUITABLE wood and it was the most abundant suitable wood in the Eastern USA where virtually 100% of the cutting board industry originated. However, there are other woods that are just as suitable. To be suitable, they need to be hardwoods (has nothing to do with hardness, it is a definition. Softwoods are too pourous), need to be sufficiently tight grained (almost all hardwoods are) and preferably impart no odor or taste and be non-toxic transdermally (vitually all woods including maple are toxic when inhaled). Maple has these characteristics, but so does walnut, cherry (slight taste), ash, oak, and purpleheart - as well as many others.
3) End-grain not important? Absolutely not true! Any serious chef should invest in an end-grain cutting board. There is no reason not to! They are more expensive because they are aparantly much more difficult to make - that's the downside. Aside from the bacteria resistance, the main benefit is that they are MUCH easier on your knives. when you spend big $$$ on a nice set of knives, its a no-brainer to buy a cutting board that will make your knives edges last 2-3 times longer! End-grain construction allows the knive to slightly cut into the board rather than smacking against a hard surface. Edge grain is second best, but the common flat grain wood boards are almost as bad on your knives as your countertop is! Of course, plastic is also easy on your knives but are the worst for bacteria after they become used. Glass and marble are excellent for safety, but are the worst on your knives. Another benefit is looks - they are beautiful and they stay that way.
I ended up buying the checkerboard cutting board that I found online, mostly because of the wealth of information they provided AND I was able to verify it from different sources. The only thing I now have against the board is that it looks so good I rarely use it! To solve that problem, I also bought a plain maple one from them and I now use the fancy one for special occasions only. I can't think of the URL right now, but I think i posted it before.
By the way, they gave me a a great discount on the second board for "being a valued repeat customer", which i thought was great.