Choosing Font for Screens

This is a great website for comparing fonts quickly:
http://www.typetester.org/


Other guides:
http://www.will-harris.com/typoscrn.htm
http://www.a3webtech.com/index.php/best-fonts-onscreen.html
http://www.design-by-izo.com/2010/06/07/8-excellent-fonts-for-screen-and-print/
http://www.quora.com/Why-do-most-websites-and-mobile-apps-use-sans-serif-fonts

!!http://www.bluetrainmobile.com/blog/choosing-fonts-for-your-mobile-website/