Web Designer Depot put together an excellent round-up of online data visualizations — that is, graphical representations of information. From the post:

Wrapping your brain around data online can be challenging, especially when dealing with huge volumes of information. And trying to find related content can also be difficult, depending on what data you’re looking for. But data visualizations can make all of that much easier, allowing you to see the concepts that you’re learning about in a more interesting, and often more useful manner.

I especially like the many examples of visualizations that change in real time to communicate ever-changing data, such as Web traffic.