There are two types of files on the web page, MP3 and Flash Audio.
Each has a specific purpose.

Hear It Now - This file is used to play the talk "immediately."

It works well on Windows and Mac computers and will load very quickly. You simply need to get the "free" Flash Player here, if you do not already have it, or if you need to update it. This player will open in a new and seperate browser window. This will allow you to listen to the talk while you continue your browsing.

MP3 - This file is used for downloading the talk to your computer.

Windows Computers: - Clicking on the MP3 will typically start the download. However, if you have an active MP3 player in your computer, the file may start playing instead of downloading. If this happens you need to "right click" (or "control click" on a single button mouse) on MP3. Then select "save target as" and answer the questions after which the file will download. After the file is downloaded you can burn it to a CD or load it to a MP3 player such as an iPod. You can also listen to it on your computer if you have a MP3 player. You can download a Windows MP3 player here (Windows Media Player). Download only the "Free" file and not a free trial software.

Mac Computers - Same as above except you select "download linked file." You can download a Mac MP3 player here (Apple Quick Time). Download only the "free" file.

Note - The MP3 files are very large, usually 12-15 MB each, so if you have a dial-up connection it will take a sizable chunk of time to download the file. The Real Audio Player download is also 12 MB large.