In the soup grab thread I pointed out that Gingy is able to hit his B attack from a grab in two ways - by doing a standard BASG, or by following a JASG up by pressing B. The second method is actually a lot better than I'd first thought - because it drops the opponent directly next to you, in stun, ready for a regrab. This naturally leaves a lot of options for comboing, but I thought I'd just point out two I found of interest:
Infinite (GFY): Clearly, this combos into itself. It's quite possibly the slowest infinite damage-wise which I've ever seen.
Continue combo: Pressing A again will continue the combo into the rising attack. I can't see many uses for this at the moment, but it's a nice tool to have in the bag I suppose.