Hi guys, thought you might be interested but just found this book on ebay - Tokyo Disney Sea by Shinichiro Kobayashi. Looks like it has specially put together for the 5th Anniversary:
it is on ebay.co.uk and item number is 170083164816
I am mentioning this on here as I have seen a few people asking about books on the Tokyo Disney parks, but cannot find the threads to be able to post a message back. I managed to get myself a copy of this when I went, it is highly recommended!