I suspect this will be some welcome news for people working with OCS 2007 R2 and Lync Server 2010, we have begun to document the firewall ports needed with the deployments: 

OCS 2007 R2 Firewall Port Settings

As a Wiki this allows the community to contribute to the content which means it should reflect real customer configurations from those that worked on documenting and resolving it. This particular topic has started with MVP contributions and the content for Lync Server 2010 will be coordinated with the protocol poster like we did with R2. The Office Communications Server 2007 R2 Workload Architecture Poster for now will remain unchanged and leverage the Wiki content as a supplement. For Lync Server 2010 we have an opportunity to coordinate the efforts.

The TechNet Wiki as you will see is noted as beta and so your feedback is welcome on any aspect of what you see or what you want. You are free to contact me via this form or my email address (toml at microsoft dot com) as we want this solution to be valuable for you.

TomL