Ginny mentioned doodles.  Check out
http://www.jfklibrary.org/newsletter_winter-spring2005_08.html
and
http://www.jfklibrary.org/pr_doodles_release.html 

BTW, in describing the record status of Presidential papers, I should have added that they can have artifactual as well as informational and evidentiary value.  The fact that a President or other notable held a piece of paper, actually signed it (as opposed to having a staffer sign it by autopen), or reacted to what he or she was reading by jotting down a reaction in the margin obviously can have interest for collectors as well as historians. 

In the Nixon records, there is a series for "Presidential Handwriting" as well as an "Annotated News Summary." The latter includes the President's marginal jottings, which show his reactions to news summaries he read. http://nixon.archives.gov/find/textual/presidential/special/staff/office.html 

Maarja

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