A good keyboard should both promote user's health (i.e. ergonomics) and productivity. Based on these standards, here are my favorite keyboards on the market.
1. Thinkpad keyboard
I hate switching back and forth between the keyboard and mouse and moving my hand around when navigating with the mouse. The TrackPoint on the Thinkpad keyboard solves that problem.

Bonus: with this keyboard, you don't need a mouse.
Bonus: with this keyboard, you don't need a mouse.
2. Microsoft ergonomic keyboard
The Microsoft keyboard, on the other hand, is superior in terms of ergonomics.

I wonder why they can't just put a track point in that blank space in the middle.

I wonder why they can't just put a track point in that blank space in the middle.
Conclusion. My ideal keyboard would thus be the combination of the two, i.e. Microsoft keyboard shape with a TrackPoint. Unfortunately, such product doesn't exist!