Have a look at this interesting article about choosing the right font and how different fonts affect the readability of text, posted by The Next Web!
“The right font choice along with the absence of sidebars and popups makes everything feel easier and better to read. Your eyes typically move across a page for between 7 to 9 letters before needing to pause to process what you’re reading. As you scan a sentence, no useful visual processing is happening in your brain. Visual processing is completely dependent upon the information taken in when you pause.”