Jason,
very clean seconds, even from the back angle. They look a bit "forced" (for lack of a better term) to me though. I would love to see them from a front on angle. I love playing around with the technique myself.
I wasn't expecting the ending of the riffle stacking bit, you got me.
regards,
Joey
Ps: @EricShoff: Most of those bottom dealing techniques are in Marlos "Seconds, Centers and Bottoms".