Cooler Planet has a really cool interactive map of California Solar Power. It interactively narrates total installs, total Megawatts, average system size and total Kiloton pounds of carbon emissions saved. It covers 1999 through 2007. The stats demonstrate a 17x increase in solar installations over the last 6 years. It is a very nicely done map and (for me anyway) speaks volumes over a spreadsheet or other presentation methods.
Check it out here.