You can have all the features of this service for only $24.95 a month and cancel anytime. They offer thousands of books that can be streamed from anywhere. Audiobooks.com has created their application in HTML 5 so it can be accessed from most browsers and you will never need to install a plug in again.
They of course are in direct competition with iTunes Audiobooks and Audible. While they function more on purchasing the audiobook and obtaining credits to complete purchases Audiobooks.com takes the Netflix streaming approach.
Now that you have many choices you just need to decide if you can stream more than one or two books in a month to make the service valuable.