Humble Pies: How Many Have You Tried?

Marionberry pie, Irwin's Coffee and Bakery

There's some controversy on the subject of which day National Pie Day ought to be celebrated, either January 23 (as specified by the American Pie Council) or March 14 (as specified by the math geeks of the universe). We've got the perfect solution though: why not celebrate on both days? Certainly there's enough pie love to go around.
With March 14th coming around, we decided to forgo the usual apple, pumpkin or blueberry pie in favor of compiling a list of somewhat lesser-known pies; each is linked to a recipe or page explaining its history. Maybe you'll come across some old favorites or new discoveries. But mostly we're curious...how many have you tried? 
If you're so inclined, feel free to post about it on your site or leave a comment below--if you want to get really fancy, you can specify which ones you've tried by italicizing which ones you've eaten, and link back to this post so everyone can judge--er, see--your responses!
And of course, if you have any other "forgotten" pies that you think we should know about, do tell!

Acorn Pie
Avocado Pie
Bean Pie
Butter Tart Pie
Cactus Pie
Chess Pie