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Reading Pfanz's trilogy on the battle of Gettysburg.
Last time I tried wading my way through these I got lost in the incredible amount of detail Pfanz includes in his writing. More, and more detailed, maps would have helped.
This time I'm keeping Google Earth open as I read. It really helps with the mental picture Pfanz tries to create, even though the battlefield has changed some since 1863 (primarily in the amount of trees, orchards, undergrowth, and fence lines).
Some of the most useful assistance rendered by Google Earth comes in being able to use the 'ruler' function to get a bird's eye view of the distances (yards and miles) in Pfanz's account.