My ~2000-era MS Natural keyboard has the following. (I keep it in a drawer, as an emergency spare for when I run out of MS Natural 4000s.)
- Full navigation cluster
- Arrow keys away from the main area
- Ctrl+Shift in line on both sides
- Right-hand Alt key
- Right-hand Windows key and right-hand Windows context key (you don't need both IMO, however having one is useful as you can remap it to be the right-hand version of the one you do use - the MS Natural 4000 is fine)
- Only one B key
- f6 on the left side of the split
For a device that relies so much on muscle memory, you'd think that designers would do a better job of laying theirs out exactly like every other one. But... apparently not?
My search for a replacement continues.