Jeff pointed me to this article by Nick Berry. It’s kind of fun but of course if you know your opponent will be following this strategy you can figure out how to outwit it. Also, Berry writes that ETAOIN SHRDLU CMFWYP VBGKQJ XZ is the “ordering of letter frequency in English language.” Indeed this is the conventional ordering but nobody thinks it’s right anymore. See here (with further discussion here). I wonder what corpus he’s using.
P.S. Klutz was my personal standby.