Natural Keyboard
Used by 3 peopleen.wikipedia.org ↗
“Plus a MS Natural Keyboard because I have occasional tendonitis flareups in my wrists and this seems to help.”
Josh Millard Interview, Musician, developer (MetaFilter) · via Uses This 
“I prefer to type on the original (circa 1998) PS2 Microsoft Natural Keyboard (not the Elite!”
Justin Frankel Interview, Software developer (Winamp, REAPER) · via Uses This 
“I've used a Microsoft Natural keyboard for over a decade, and really like the split keyboard, which is way more comfortable for my wrists.”
Mitch Altman Interview, Inventor · via Uses This