I also agree that you get more binkies when they are babies. My Stashu binkied all over the place when she was small, now that she's 15 pounds (flemish giant, not horribly overfed!) I think its harder to get her self up in the air! You can still tell when she's excited though, I get the bunny 500 when she is about to get treats!
Chadsmom- a binky is when a bunny gets excited and they jump uncontrollably into the air and usually twist around a bit. It's how they express excitement or let you know they are having a good time.