"Cubism.js is a D3 plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from Graphite, Cube and other sources. Cubism is available under the Apache License on GitHub."
A somewhat hard-to-find-but-useful set of ggplot2 examples buried on Hadley Wickham's site.
I saw this on a few different visualization and statistics websites. It's a nice set of maps.