[jonbarker]

I second the motion on firecalc because it really helps you visualize in how many 30 year periods historically you would have gone to zero (which is obviously the thing everyone most needs to avoid). The 100 year averages are useless as they don't encapsulate realistic investing lifetime chunks of around 30 years, the firecalc approach gets around this with the 30 year increment parameter (which you can tweak as well). It's a better way to approach the problem.