http://www.sermonindex.net
A quote from their "About Us" page...
They have both text, audio sermons, & video, as well as books... all are free to read, download & use.SermonIndex is not just a website but really has become a movement of believers seeking the 'old paths' (Jeremiah 6:16). This journey of faith weaves through the current state of evangelical Christianity and the passionate preaching of many godly ministers in our day. Many are seeking authenticity, reality and sincerity in the Christian faith. In a day when popular preachers are telling lies (Jeremiah 5:30-31), there is a great renewed desire to find the real Jesus in the midst of the counterfeit. SermonIndex has been able to archive many of the best preaching messages given in the last 50 years in audio mp3 form, as well as digging into the history of the Church and archiving many of the encouraging text messages given.