Most interesting: "Evidence suggests that the most commonly used fonts tend to be equally legible at the 10-, 12-, and 14-point size."

I had always suspected this, especially with fonts like Verdana, but never had any facts to back it up. These studies are a great resource, especially considering how much it usually costs to read the results of studies of this depth.

There's a really funny followup here:
http://www.syntagm.co.uk/design/articles/simuser.htm
(includes a picture of the "ideal user" ;-)

(via http://poorbuthappy.com/ease/000477.html )