Screen layout readability

The effects of screen layout on readability. Just two papers at present:

Summary:
 * Have a consistent design throughout your webpage, don't change it from one page to the next.
 * Have a high contrast between text and background colour, dark text on light background is best.
 * Have about 10 words per line of text, its easiest to read.
 * Apparently this line length is less important on a computer than in a book though, as we tend to read text on the screen from further away than we do when reading a book (so the angles our eyes have to scan are smaller and easier)