Alex, Right you are. I seemingly droped the I. My previous post should have read:

The Blue Moon progression (I-VI-II-V) in the key of C becomes C,Am,Dm7,G7. Note also that Dm7 (D-F-A-C) is just an inversion of an F6 (F-A-C-D). Same notes! You could call it a IV6 if you want but it's still a IIm7.

Thanks for staying awake.

      - Mark