Microsoft has already documented the supportability of OCS 2007 with Active Directory 2008, you just have to poke around the Supportibilty documentation for the answers.
Yet, I've put most of it together here: https://blogs.pointbridge.com/Blogs/schertz_jeff/Pages/Post.aspx?_ID=30
Also, Tom Keating has blogged about some rumors surrounding an upcoming release of 2007 R2 that might address this issue, but nothing has been officially released yet. Regardless OCS currently works with AD2008, so if you are still having deployment issues they are probably environmental and not limitations of the product.