If only we were all as talented as the chalkboard typography artists out there... but alas, not all of us possess that skill. I'm all for this easy, "cheater" method that gets pretty close to the real deal.
To make her typography art, Savannah copied her computer-made design onto transparencies, and then used a projector to help her draw her typography art.
Savannah also used a bistro pen, but using actual chalk will get you even closer to the authentic look.
Find the tutorial on Classy Clutter.