You'll get no argument from me on the mobi/azw comment! I've guilted my SO into Nooks only for just this reason. Thanks for the response.

Maybe this should be reclassified to a feature request, but a couple ways to tackle would include:

• User-specific exclusion. If they can set this themselves, even better
• Toggle switch(es) in the interface to show or hide specific formats
• Tags on each file that show at a glance what format it is. While it doesn't solve the issue, it would save users from some trial and error when multiple formats are present for a given title. Something like this, except less MSPaint-y

  

Same here. In a perfect world, I'd like to see coverart and metadata from the ID3 tag, in the same UI as books, and maybe even a dedicated audiobook section apart from raw files. It's no fewer clicks to get the book downloaded and playing; it's just a consistency thing for me.

My wife has just requested her first audiobooks, and I'm doing the same as Bobby above with raw files. Would love some proper audiobook support. 

Also 2nd everything else he said regarding the best damn book server on the intarwebz :)