Arthur Pounder who has been posting for sometime now about LCS 2003 & 2005 has posted about OCS Licensing and provided a full reference library including the trial software and other reference material which can be found at :

Microsoft Unified Communications User Group (UK)

Careful, this post is a laundry list, but it is one you should probably bookmark!  Of particular interest to me is the link that points to OCS capacity planning.

Sweet!  Thanks Angela!