Here it is. Every audiobook I know of in chronological order occurring in the Star Wars universe, with Year 0 corresponding to Star Wars Episode 4: A New Hope (in the canon, the specific Year 0 event is the Battle of Yavin). Most of these are still commercially available. If anyone out there knows of more, please comment below, so I can add it to the list, and my collection.
I've also got links to the audio for a few "read along books" below (Planet of the Hoojibs, Droid World, etc.). If you would like to download complete books with audio in Flash format or just the audio in MP3 format, visit Read Along Adventures.