Thanks for the informative article. Did you try MacBreakZ? It is not free though.
Personally I noticed a big difference in the type of mouse. I am not typing much and I do not type 'touch', but a few weeks with a three button mouse with scroll wheel really aggreviated my RSI problems. So much that I perfer doing my Windows stuff in Virtual PC on the Mac ( I support a mixed environment).
After switching back to the Mac the RSI pains disappeared again in a few weeks time.