As Sahil mentioned on his blog we've built (Sahil rewrote my dodgy presales code) a tool to Replicate the structure of MOSS 2007 User Profiles - very similar to the Search deployment tool.

What is this utility?

The "SharePoint 2007 Shared Services Provider User Profile Property Replicator" was designed to take custom user profile properties and export/import them into another MOSS 2007 server. During most development cycles you will create custom user profile properties and currently the only way to move these from DEV/TEST/PROD is to backup/restore the Shared Services Provider. This tool will now reduce the amount of manual interaction required.

 

Go to the CodePlex project to download the Code/Build/Collaborate on this tool - it is over to the community to evolve it.