I enjoyed your tutorial on adjusting opacity. I've been doing it for several years, but your suggestions for how to use adjusted layers were a reminder of techniques I often forget.
One question: you mentioned a "scrubby slider", which I'd never discovered. I checked, and it's available in PSE 10. But in playing with it, I couldn't detect any appreciable difference between using that slider and the regular percentage slider. Is there any difference in the outcome?