I know a lot of D's, D is a friend of mine, but it was only recently that it occurred to me to do the two-finger D by barreing at the second fret, and putting the second finger on the third fret on the b-string. Sometimes that's handy.
    For some reason I've always liked to do first position G without a 3rd, 3xoo33, until I want the B to make a dramatic entrance. Anyway, PaulM, that lets you have an extra finger still to noodle around with, and it's easy for my fat finger to kill the a-string.