oai2forcck provides an OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) gateway for content type created with CCK (Drupal 5 only). If you don't already know what OAI-PMH is, you probably don't care about this module.
Some examples. All expose unqualified Dublin Core.
I'll add comments to this posting as I play with the module a bit more. setSpec and time-based harvesting appear not to be working, but I've filed bug entries on the project page.
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