I was looking for online versions of the Points of View column from Nature Methods, and I came across this site instead.
This is very fancy stuff, but it is fun to look at the kinds of things that could be out there.
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I have now found the collected Points of View columns:
http://blogs.nature.com/methagora/2013/07/data-visualization-points-of-view.html
This site has some great articles from Nature Methods about very basic, and very useful, guides to making your point clear. It shows you how to make a good decision about your data presentation, rather than relying on what your program can do. Remember, computers are stupid, you are smart. You tell the computer what to do, do not rely on it to understand what is important.
I particularly like:
Axes, Ticks, and Graphs, by Martin Krzwinski
Plotting Symbols This article, by Martin Krzywinski & Bang Wong, gives some excellent advice about how to choose and use different symbols to make your data clear. No more fields of dots overlapping fields of triangles overlapping fields of crosses.