UPDATE: Nanu let me know that he has been using Audible air on his BlackBerry since he got it. He tried this link below and it turns out to be the same application he has been using for awhile. He can report that the app works well once set up it allows you to sign in and download your library and store on your SD card!
Audible has been beta testing a BlackBerry App for about a year now with no actual product. I gave up on it awhile ago since it looked like a pipe dream and the closed beta had reports of numerous problems.
Recently I ran across a thread on BlackBerry Forums by Grimlin (Nice taste in books BTW) detailing some great information about the Audible BlackBerry Beta called AudibleAir. Nothing I can really talk at length about since I do not have an Audible account to test it out but it may be worth checking out if you use Audible already.
NOTE: It looks like there is a production BlackBerry download available at this link below but I could not find one official mention of it on Audible’s main website:
I have not tried them but they may be worth a download if you are into taking some risks…
Let me know what you find!