Messages are posted by date and title. To download the free mp3 files go to the 'Listen to Messages' tab in the 'Main Menu' box on the left. Click on the appropriate year and search for the desired message. All messages can be sorted by message title, downloads, date or Scripture.
You may also use the 'search messages' feature under the 'Listen to Messages' page to find archived messages of various Scripture texts, titles or dates.