Yahoo Finance has a great interview with Henry "Bud" Hedeler from AnalyzeNow.com . 20 years ago Henry was retiring from Boeing, and upon leaving he was give a pretty standard retire package that showed him being able to live comfortably.
Well good thing Henry didn't just trust them, he realized that there were assumptions that he just didn't agree with like that people get less active when they are older so they don't need as much money. At 75 he kills that notion be still being an active skier and traveler.
This is a great message for us all, don't just follow the assumptions given to us regarding retirement. You might want to travel, paint, dance or go to the space with the Russians. AnalyzeNow has some neat tools to play with and test some assumptions.
Your life needs to be planned for, not planning a life around a plan...