I got in touch with Couchbase a year ago. I attended a presentation of the Couchbase guys and learned that Memcached became a part of Couchbase. Until now I never had a chance to use Couchbase for more than just a play around. Recently I stumbled upon a new Book about Couchbase: Couchbase Essentials written by John Zablocki. I will let you know what I think about it and post my review here. Stay tuned.