Importing OD users to AD

Hi Currently my office is nearly all mac, as a result we're running an OD server. We have an increasing number of PC's and I want to have all machines in the same directory space. OS X is a poor PDC at the best of times when it runs. In my test environment I have the golden triangle running, I've extended the AD schema for OD, but I'm completely at a blank on how to import the users from OD to AD. We're running Server 2008 and OS X 10.6. General pointing in the right direction would be great, a step-by-step walk through even better. Thanks in advance for any help Andy