Steve Sillett is amazing and has definitely made an impact on Redwood forestry by taking a top-down approach when analyzing trees. No one before has made it up into the canopies of these massive trees. The discovery of reiterations (the growth of new trees and different plant species in the old growth Redwood canopy) has increased interest in old growth timber stands. Furthermore, the proof that the rate of added timber volume increases as Redwoods age will make land owners think twice before harvesting their stands solely for revenue-generating purposes.
I believe that with the help of Ken Fisher and the Save the Redwoods League, Sillett and his crew will be able to analyze the last frontier of Redwoods -- the tree's root structure.
I'm a third generation California timber land owner, so stuff like this gets me excited. Nothing like softwood and software :)