Add an Alias to the Applications Folder in Your OS X Installers
I recently wrote about how easy the Gizmo installer for OS X was, it seems that this style is becoming a trend for installers, with the newly released Firefox 1.5 following suite.
My only criticism of this design is that they've added a little black arrow which looks like it's supposed to be a mouse pointer. I suppose the point is to make it obvious that you're supposed to drag the Firefox icon to the applications folder. Just doesn't quite work for me.