There are two main ways to listen to the recordings: streaming play or download and play.
Streaming allows you to listen to the recordings on your computer while you are browsing the site. This method is fast and easy to get started. On most computers all you need to do is find the recording that you would like to hear on the Recordings list (link on the left side of the page) and click the "Link". When you select the URL "Link" you computer should start to play the recording. Usually another application such as Windows Media Player or iTunes will open to play the file.
If you would like to save a copy of the file to your computer so that you can listen to it later or (more likely) so that you can copy the recording to a portable media player then you will need to download the mp3 file. The easiest way to do this is to find the recording on the Recordings list and right-click the Link. An options window will open and one of the items should say "Save Target As...". Select this option and another window will open asking you where you want to save the file. Choose the appropriate folder or device and select OK to download the file. Later you can play the file on your computer or copy it to another device that will play mp3 files.
If you are looking for a particular recording you can use the "Sort" buttons at the top of the list to help you find the recording. The default sort is by conference and year.