Visualization is a big topic on its own, which implies that you can get quite sophisticated in making plots. However, you can reveal complex information from simple plots.
I took a shot at visualizing power generation data from the Kaggle competition. My goal was just to make a "heat map" of the power generation data: for every <week, hour of week>, plot the power generated. Now, I had to rearrange the data a bit but the result was not only pretty, but more importantly, very revealing and efficient. The plot summarizes ~25k data points by revealing cycles over days and months over several years.
Enjoy. Courtesy of pandas for data munging and matplotlib for the plot.
