The Chowhound was on Open Source and mentioned potato pizza. I would LOVE to find a recipe for that since the dominant pizza is that St. Louis cracker crust.
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I'm not sure if this is what you're talking avbout, but here's what I make sometimes...
mix minced garlic with olive oil, and a little salt & pepper.
slice potatoes like discs and coat with oil mixture. Spread onto greased cookie sheet and bake at 350 degrees F about 30-40 minutes, remove from oven & top with chopped green onions, and veggies of choice or crumbled bacon (both optional) & cheese (I prefer cheddar). Return to oven & bake until done.
Many years ago, in Rome, I had a slice of pizza rustica that was covered in thinly sliced potatoes. Is that the sort of pizza you're talking about? Not sure if you'd bake the potatoes most of the way first, so that they don't make the crust soggy, and then add them the way you would any other topping? That is, right before you bake the whole thing? I vaguely recall a hint of rosemary, but i may be making that up. Not even sure if there was any cheese involved, maybe just a thin layer of olive oil between the potatoes and the crust. Starch with more starch, but YUM! Anyway, i realize this isn't a recipe, just a sort of vague guideline... Let us know if you find an actual recipe!