[meganasaurus]

Thanks to everyone's help on this thread, I've been able to transfer WMA audiobooks now by updating the Overdrive Media console software from 3.2.0.5 to 3.2.0.6 and using the 'transfer' in the media console to convert the files onto a playlist in iTunes. I had to update the Overdrive Media console manually by downloading it from the site, because the updater built-into the medial console said that 3.2.0.5 was the latest version of the software. Instead of removing the software and reinstalling it, I was able to run the .EXE file off of Overdrive's website and then overwrite the software already installed on my computer.

As other posters have mentioned, this method hasn't worked perfectly either. My books's playlist was created in iTunes, but then the playlist was empty after the files had finished copying. I was able to locate the book's individual files in iTunes under Devices --> [my iPod's name] --> Books, and then I had to drag each individual file onto the playlist.

Edit-
Also, I got a couple of error messages in iTunes saying that some of the parts of the audiobook could not be read by my iPod device, so they wouldn't synch. When that happened, I deleted the grayed-out file in iTunes, shut down iTunes, restarted iTunes, and started the whole transfer for that part again. It worked the second time. If you're using the playlist method to transfer your audiobooks, I would recommend just trying to transfer one part at a time. It's (much) more time-consuming, but I only get the error messages when I try to transfer multiple parts at the same time.