Check out Dave's article at gamedev.net on Shadow Map Aliasing. Dave is a graphics software engineer who I am working with on a Graphics SDK. He has previously published source code and articles on shadow mapping and shadow volumes on mainstream graphics hardware. This is a survey of shadow map techniques and a discussion of the tradeoffs of various implementations. Lots of great figures and math!
Shadow Map Aliasing
by Dave Bookout
http://www.gamedev.net/reference/programming/features/smaliasing/default.asp
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