Thanks for the email and glad you liked my vanish.
I call it the Monticup vanish ;-)
Actually it's just one of the moves I picked up watching one of our Sponge Ball DVDs.
I don't know what the move is called, but it's my favorite for sponge balls, as it looks natural.
Encyclopedia of Sponge Ball Magic DVD
http://www.magictricks.com/DVD-encyclopedia-of-sponge-ball-magic.html