I'm working on a web app, and I'm creating some data viz tools for it. For one particular series, I've got an extremely wide variance in data values (0 to millions). We're using a column chart to view the data now, which of course results in some columns that are a pixel high or smaller. We already have some ways to slice the data that helps a bit, but I was wondering if there were different kinds of visualizations out there in common use that deal with this type of situation better. And if so, if there were JS libraries that help implement them.
A standard approach to dealing with data that has a wide variance is to use a log scale (or some other kind of scaling approach) regardless of the visualization itself. This could be applied in any graphical package (including a JS library like Protovis).