Great article, thank you Scott!
Have my own test environment, and followed every step. Everything went smoothly, but, my first attempt to install Exchange 2007 Beta 2 on the Active node of the cluster failed, with the following error: An error occurred. error code was 2147500037. The operation failed. The ExchangeSetup.log didn't give much more information (same error message listed, right after he stated that he was creating the IIS Metabase objects for Base DAV protocol). Re-ran service pack 1 of Windows 2003, and it went perfectly fine! Passive node was installed in about ten minutes without a problem.
Great feature this CCR, and LCR! Looking forward to the "stretched" options after RTM!