[Leica] Lense test targets...recommendations?

[Austin Franklin <austin@darkroom.com>]

Any recommendations on targets for lense testing, and where to buy them?  I 
am trying to test out a number of cameras for sharpness against a known 
target, and a consistent target.

From what I can tell, Edmund Scientific has a pretty good assortment.  Any 
other suggestions for another resource for test targets?

They also have a primer on test targets:

http://www.edmundoptics.com/techsup/pdf/TestingTargetSelectionPrimer.pdf

It is only somewhat informative...