Not sure how long this has been available, but it just passed before my eyes on a mailing list and was well worth the look (and somewhat lengthy download). This long, detailed and image-rich powerpoint presentation is mostly a discussion of the Open Archives Initiative (though other services, such as Cite-Seer, are also mentioned). It provides a detailed look at the purpose of OAI, OAI search requests and data formats, available software and online archives.
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