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I think this would be changing the content type of the content so it isn't a straight forward thing to do, especially when CCK comes into play. Fields would need to be mapped between the two content types, etc. In my looking around, I haven't seen anything that does this so I'm changing this to a feature request. Hope this is okay.

Sorry, I don't see any real use case here.
In the worst case the old : copy&paste can do the job.

Node Convert is a module that allows converting nodes from one type to another, by group or one by one. Find it at http://drupal.org/project/node_convert. I hope it helps.