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Multi plots in a page gridExtra package …

Multi plots in a page
gridExtra package makes it easier to put multiple plots generated by ggplot2 in a page equivalent to par(mfrow= ).
Example:
http://code.google.com/p/gridextra/wiki/arrange
came across through a conversation in StackOverflow
http://stackoverflow.com/questions/1249548/side-by-side-plots-with-ggplot2-in-r

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How to select the first/least/max row pe …

How to select the first/least/max row per group in SQL

A nice explanation about the subject. Easy to understand.
http://www.xaprb.com/blog/2006/12/07/how-to-select-the-firstleastmax-row-per-group-in-sql/

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An nice example of using in Beamer clas …

An nice example of using in the Beamer class in LaTex

Using overlays for source code listings in LaTeX Beamer