For those in to minutiae and detail...
I think this is new in 10.5.7--
Apple goes Green and has changed the Energy Saver light bulb (icon) in System Preferences from an incandescent to a CFL.
Hmm... I'm not seeing that on my MBP.
Bruce,
Did you use the Incremental or the Combo updater? (I used the Combo.)
I updated with Software Update. Maybe I'll go ahead update again using the Combo updater when I have the time.