The powers that be, think that the keyboard function keys are better than a widget
I noticed it was missing too but I have SL installed on an external hard drive so I just copied the widget from there. If you have a copy of SL you can get your hands on, it's in /Library/Widgets. If not I can send it to you through sendspace or something similar if you'd like.
Could you send to file hosting service, can be hotfile.com