I thought everybody would get a kick out of this:
The color scheme chosen for that page matches what they found was the most “readable” color scheme.
Surprisingly enough, it’s really close to what we keep here at CW!
There is also a good article on physiology of reading.
About the AHNCUR research, I must admit I would have trouble to decide which of the three fonts tested is worse – they are all horrible and completely unsuited for reading on screen 
A similar (albeit much older) research about spacing in text.