NPR's electric grid
NPR has the coolest tool on their website. It's an interactive map of power sources, power lines, and power types (power plant, solar power, or wind power). It's a great way to visualize not only where you get your power from, but how the entire nation is connected, and the different ways other states get the majority of their power.
Try clicking the "power plants" tab at the top...you can mouse over the dots of power plants nation-wide to view more information about each plant. I must admit that while it is amazing to see how inter-connected our nation's energy grid is, it's also quite distressing that so little of our energy is coming from wind and solar efforts. I wonder what this grid will look like in 10, 30, 50 years...

