A Drag'N Drop Flash map to visually test geography knowledge: http://www.sheppardsoftware.com/states_experiment_drag-drop_Intermed_State15s_500.html somehow calculates (cumulative) margin of error.

http://www.1-900-870-6235.com/FibonacciZoom/ZoomTest/3LevelZoom4.htm#

A blinding flash of the obvious: "Content sites just present info that anyone could have found themselves (with a search engine and alot of time?)."