When migrating a site from plone 2.x to plone 3, I often have to port customized workflows. Back in the plone 2.0 days we hadn't generic setup, and workflows were created with python code (with the help of DCWorkflowDump), or directly created in the ZMI and installed on final site by importing a zexp.
Nowadays we want to use generic setup (GS).
The simplest way I have found is to export the workflow as a zexp, import this zexp into the new site, and then make a GS export. Done! you've got a nice XML definition of your workflow, ready to be included in your product GS profile.
Once I encountered one caveat: if the original workflow contains strings that are not in plain ascii (in titles, etc...), the GS export will fail. You'll have to relabel properly everywhere, and add all those labels (msgids) to your translation files (I think i18ndude does it for you).
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