If you don't subscribe to MacLife there's an interesting article recommended to us by De Prez Jim Hamm. "Fifty Things Every Mac Geek Should Know" turns out to be an 8 page piece, with such subheads as "Why OS X is Better Than Windows" and "Spotlight Can Do Math." There are short handy lists about iPod, iPhone, iChat, Safari, Terminals, on and on. http://www.maclife.com/article/feature/50_things_every_mac_geek_should_know
Take a look for yourself.