Within science publishing, the [http://reedgroup.ucr.edu/seaofpubs.html least publishable unit] is the smallest amount of new data that will be accepted by the scientific community as an acceptable incremental addition to the scientific literature. Compare Darwin's [http://www.literature.org/authors/darwin-charles/the-origin-of-species/ Origin of Species] to [http://www.nature.com/genomics/human/watson-crick/index.html modern journal articles] to begin to understand the trend in scientific publishing.

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You can actually declare posters and PowerPoint presentations as AcademicPeerReview""ed submissions now. The same poster can be cited several times as long as it appears at several conferences. 

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How are people performing peer review of PowerPoint presentations?