Mac OSX version is Intel only
The Mac version of Couchbase Server works only on Intel Macs. I found this to be true with the CouchOne CouchDBX, too. (I am just getting into CouchDB over the past week, so am just getting my development environment setup--I am switching over from CouchDBX to Couchbase Server now.)
My main development machine is an Intel Mac, so this is no immediate problem for me. But, it'd be good if you noted that the Mac version is Intel only, as some of us do still use PowerPC Macs. If it's easy enough for you to do, even better would be if you have make Couchbase Server work as a universal Intel / PowerPC binary.
Thanks and congrats on the new Couchbase launch!