Thanks Nophead, that did the trick.
I already had that Github file you linked, just didn't have the Melzi folder copied into the Arduino hardware folder. Once I did that, it now shows up and my computer is now 'speaking' to the printer. FYI, so far, the 1.0.6 version is working well.
For the future, do you think the Marlin 1.0.0 (that you linked) and the Arduino 1.0.1 (or 1.0.6) is the latest/greatest for Mendel90? Is that what you're currently still using?