I just saw this on Publishers Weekly and had to comment.
Apparently Macmillan is making about 11,000 books available to libraries, which is pretty spiffy. Ever since college started to royally kick my butt and demolish most of my spare time I've mostly spent my time listening to audiobooks, but getting more e-books is always a good thing. I can vouch that there is nothing more frustrating than trying to download a certain book and finding that the library doesn't have the ebook for that specific book. Sometimes they'll be part of series, which will really get someone flustered.
This is ebook only, but this is pretty great news that makes me fairly optimistic about this opening the door for more audiobooks to hit the library OverDrive systems. That's still a pretty underserved portion of the online library market where you have maybe about one audiobook to every ten e-books, but this gives me hope that eventually more publishers will make their audiobook catalogues more available.
Now this doesn't guarantee that your library will necessarily option the books for distribution, but it does mean that it makes it more likely that it'll happen. Of course you could look at this as another step towards libraries becoming obsolete (a reason why I'm going to get my library degree in information systems), but it's something that will greatly benefit a lot of people who have internet access but can't immediately access a library for whatever reason. (Distance, illness, disability, etc)