dimicharIt's the "standard" US layout, with a wide horizontal Enter key, and a bottom row where there's just a spacebar and a bunch of 1.25u modifiers like Ctrl, Alt, etc. but no arrows.
The other, non-ANSI hotswap version lets you have arrow keys on the bottom row, by resizing some of the other keys.
And the DZ60 solder board lets you make even more layout changes, like splitting wide keys into two, having a stepped Caps Lock, and squeezing in extra keys for European ISO layouts.