A37 and A57 what's the key difference?

The main difference is the LCD is a much higher quality on the A57.  Personally I hate the lower quality screen on the A37.

Plus the body.  I find the A57 fits much more comfortably and feels more substantial.  The A37 looks a bit small to me and just doesn't feel right.

Oh and I don't think the A37 does the panorama mode.  Not a great loss there.