Wow, Prokop, thanks!
I've been making jerky for years and never heard of such a cutting board. At first I couldn't figure out how it worked, but Google was my friend.
My approach has always been to just take a really sharp knife and approximate a 3/8" cut. It was quick, but the sizes are never uniform.
I'm going to have to go out and make one of these!
I'm assuming an electric knife would make the process much quicker?