Holding down the option key while perusing the Finder menus reveals some neat options for manipulating windows. OmniWeb also reveals several options which are not otherwise available directly from the menus.
I guess these are some of the little things that Jobs said wouldn't be found for a while, but show the detail put into the interface. I tend to agree.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010614183153300