adamrice / #typeface

http://www.archive.org/stream/americanspecimen00amerrich#page/n9/mode/2up

Type specimen book from 1912.

http://www.design-by-izo.com/2011/10/18/what-should-i-look-for-in-a-ui-typeface/

interesting comparison of typefaces used in UIs

http://www.theleagueofmoveabletype.com/

another source for web-embeddable free fonts

http://www.fontsquirrel.com/

source for web-embeddable free fonts