I just checked the Technet website, and Office Communications Server 2007 and Office Communicator 2007 are now available to download. If you haven't signed up for a Technet/MSDN subscription, you can visit http://technet.microsoft.com/en-au/subscriptions/ and sign up now. A full list of the benefits of a Technet Plus subscription can be found on the Technet site, but some of the highlights include:
Technet Plus is a very valuable resource for any IT Professional or support group. No MCSE should be without it.