Know the difference between a Benjamin Moore Mulberry, Behr Plum Jam, and Glidden Valhalla? What about the difference between a Queen Anne Victorian, Gothic Revival, and a San Francisco Stick? Neither did we until readers tipped us to these two sites:

Colorcharts – billed as the “online library of manufacturer’s standard [paint] colors,” this site is ridiculously useful, informative, and addictive (perhaps even more so than Google Earth…).
Architectural Styles – San Francisco real estate agent Sharon Kramlich provides a fantastic guide to San Francisco’s numerous architectural styles (and some history).