I know I’ve posted information about ISBN’s before but Joel Friedlander on his website, The Book Designer, gives more detail than I’ve found in other blog posts before and is worth sharing if you’ve ever questioned whether you should accept that free ISBN from createspace or any other publisher. This post has information that should help you decide.
Some details about the illusive ISBN! Thank you Emily Suess and She Writes. (What a great last name!) Just an FYI, you have to purchase the barcode (those black lines below the ISBN) separately.