My book has been out for a couple of months in the UK and one month in the US and of course we're trying to make sure it's in all the book stores, especially the chains. On the website, initially we had a link only to Amazon, and that annoyed Barnes and Noble to the point of saying they wouldn't stock the book unless we also linked to them. Of course I was happy to do that anyway, it was an oversight originally, but it does show how important it is to keep all the players happy. If you've got a website on which you're selling your book, be sure to link accordingly.
Barnes and Noble now has placed an order for the book. Next, we're hoping Borders will follow suit.