You can access the Talk Library via the "Talk Library Catalog" tab to the left. There are currently over 900 exhortations available, all of which are available for download.
Also to the left are talks on a particular subject. These are from gatherings hosted by the Clinton, Arkansas ecclesia, except for the 2009 Arkansas Bible School. All of these talks are listed in the talk catalog as well, but are divided off by subject here to retain the continuity of the classes. Simply "right click" on the title, then select "save target as" to save them to your computer.