Episode 9 spoilers
Well, it looks like that whole lightshow theory is debunked, and we got a pretty good look at how the Aang takes bending away.
Well, if I'm remembering this correctly, Aang still lit up when he performed the energy bending on Yukonne. Still nothing from Amon. Also, Aang held his hand in place; Amon pressed it against Tarrlok's forehead and removed his hand pretty quickly. It may turn out to be true after all; we'll have to see.
Anyway, another amazing episode. I don't know how the creative team is managing to keep this up, but hey, I'm not complaining. That season finale will not be here fast enough.