Less well known is the diversity of blade types made by Microplane. There are at least 8 of them, each of which cuts differently. And, of course, they come in numerous configurations.
As Mike points out, they are fantastic tools in both the kitchen and the workshop.
One correction, however. The Microplane was not "a remarkable new form of wood rasp." The Stanley Shur-Form tools preceeded them, and used the same style of blade. The difference is that advanced metal-working technology allows the Microplane's to use smaller teeth that, as a practical matter, never need sharpening. The Shur-Forms would go dull, over time, and the blades had to be replaced.
I still have both a flat and a round Shur-Form in my workshop. But, to the best of my knowledge, replacement blades are no longer available.