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If you are looking for presentation quality graphs then SigmaPlot is very good, it can export as jpeg/eps/png @ 300dpi and you can add text, lines, arrows, etc. It can import and work with excel files and has some good fitting and transform routines. I do all my analysis in excel and copy and paste to sigmaplot. By default it produces graphs that look MUCH nicer than excels.
In my experience its easier to create good graphs in SigmaPlot rather than Excel OR MathCad, which is not a dedicated presentation package. I have not tried gnuplot.
Go LaTeX.
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I like to browse in occult bookshops if for no other reason than to refresh my commitment to science.
-- Heinz Pagels, "The Dreams of Reason"
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