James Fallows of The Atlantic, (and one of the smartest people on the planet regarding just about anything), has a blog posting about his switch from PC to Mac. Now, this is a guy who has been deep into computers since the Pleistocene. He is a high profile convert if ever there was one. Post is here: http://jamesfallows.theatlantic.com/archives/2008/05/my_three_computers_macbook_air.php
He also refers to David Alison's blog, which lists a bunch of Mac tips for the former Windows user, from which I learned a few new tricks.