If you currently subscribe or are considering subscribing to OverDrive's ebook service, you owe it to yourself to go read Sarah's (LiB) post about how OverDrive is offering different catalogues to libraries based on how those libraries define their service areas. Apparently it is in OverDrive's TOS, but it's not very clear, and OverDrive hasn't taken the opportunity to clarify their position despite numerous attempts on Sarah's part to get them to comment.