Once the flour is dried out it may be a little coarse. You can put it in a cleaned out coffee grinder to get a finer texture. A good food processor also works and I am pretty sure they make attachable gadgets for mixers that really mill the flour if you get completely obsessed.I'm going over there uninvited for pancakes. Link
Our favorite use is acorn pancakes. Just mix the acorn flour 1/2 and 1/2 with wheat or other flour from your favorite recipe. I love the acorn flavor - slightly nutty, very hearty. If you make your own, let us know how it went.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects