This is a *very* good thread. I'm especially happy about the advice on CRs, since it's something that doesn't come naturally to me.

One think to note with Fax's "simple" method--it doesn't work, of course, for monsters with a very heavy reliance on special attacks. A nymph, for example, has CR over *twice* her BaB.

Similarly, Fangthane's method (although it works against spell-using creatures that rely a lot on evocation-type spells) doesn't work for creatures that make heavy use of save-or-lose type abilities.

And there's alternate damage, too, of course. An Allip can't touch your HP, but it's still CR 3.

Those are probably good sanity checks for a *minimum* CR, though.