I noticed the lack of ssh-copy-id for osx and decided to develop the command line utility copymykey, which appends the specified key to the specified server. It has the default of .ssh/id_rsa.pub to .ssh/authorized_keys or allows you to specified the location manually. It is a great replacement for the missing ssh-copy-id. Once you copy it, it even tests the connection for you shortly aftwards.
Full Specifications
What's new in version 0.1
General
ReleaseJanuary 27, 2013
Date AddedJanuary 27, 2013
Version0.1
Operating Systems
Operating SystemsMacintosh, Mac OS X 10.7, Mac OS X 10.8