An amazingly useful little tool to let you export and re-import those custom profile properties across your testing/dev servers.  Makes deployment much easier.

And you thought this was another sharepoint tool you'd have to write by hand?

http://www.codeplex.com/MOSSProfileReplicate/

Also, for managed and crawled properties, check here:

http://www.keirgordon.com/2007/01/export-import-managed-and-crawled.html