First and foremost, I should say that I learned how to do this originally from taking a Techshop Workshop from the man who wrote this instructable: http://www.instructables.com/id/Making-an-end-grain-cutting-board-I-made-it-at-T/
This guy runs a Techshop Workshop for making end grain cutting boards, and having taken his workshop I highly recommend it:
WKS100: Two-Tone, End-Grain Cutting Board Workshop
This instructable should act simply as a supplement to his instructable. As a newcomer to end-grain cutting board making I made a few mistakes and observations that should hopefully make anyone else willing to tackle this project even more informed and prepared.
I made it at Techshop and I highly recommend anyone near one to check them
Some nice pieces of wood (the cutting boards you'll see here are made with maple and cherry)
Glue: I used Titebond II. Just make sure it's food safe and will hold up ok when wet.
Lots of sandpaper
Heat gun (not necessary unless in cold environment)