If you are building a bike, or upgrading a fork on a bike, it is important not to upset the geometry too much. If you do upset it, it can lead to sudden unpredictable wipeouts etc and possible resultant injuries.
In order to achieve the best end result, you really need to know the axle to crown measurements for the given fork you are putting on, to make sure it equates with the design intention for your frame. If you are dealing with a 140/150 travel fork then you can have a difference of 25 mm between the various different options available, which can effect the handling quite a bit.
SO.......I was thinking that it would be good if the cycling press adopted a default position of measuring the axle to crown lengths on the products they test and feed them out to the public in their reviews.
It'd also be good if the manufacturers quoted that measurement on their product descriptions.