OK, so it really wasn't a selling point for Panther, but I am a convert now to the feature called Expose! It is one of the best features of Panther. Basically, if I push F9, all my open windows shrink and I can see all open windows at once. If I push F10, all windows in the current application shrink and I can see all of those. If I push F1, all windows go away and I can see my desktop. It doesn't sound like much, but once I got used to using it, it is a fantastic feature. Wish there was something like this for Windows!