Caroline, have you seen paperfreak's postings of cookbook contents and ingredients in the childboard "Cookbook Contents"? under Recipe Book Recipe Reviews.
This is the very reason she is making these lists, type in your ingredient(s) and recipes containing them will be highlighted in yellow. I checked all the books she has done so far and the only recipe I have found using potato flour is Sue's Famous Chocolate Cake on page 75 of GF cooking. You must put "potato flour" for the search to work properly as she explains in the preface to her lists. This is the first time I have used the list but it was a great exercise in how it does work so if anyone has an ingredient in their pantry and wonders why they bought it, I suggest you check out these lists to see if you can come up with the answer. The work involved in these lists is a credit to paperfreak and if you use any of these books frequently, it has to be a very useful list.
For recipes on the forum, all you do is go to the home page, type in "potato flour" and recipes will come up with these words highlighted.