Please note that workflows and workflow data will be stripped if you use site export/import! If you look closely at this article you'll see that it mentions this! We have a very mature SharePoint intranet and just learned the hard way that you cannot do a reorganization of sites across site collections and keep the workflows intact.
This little fact is way, way, way too subtle. Why, Microsoft, would you do this?!? Why wouldn't you warn us when we're using stsadm???