Making Grape Jelly

Thanks to my cousin Jason, who dropped off a ton of Concord grapes a few nights ago, I'm now making batch after batch of grape jelly.  I use the simple recipe straight out of M & S Meyer's Saving the Seasons, my latest favorite preserving guide.  We're thinking about mashing some of the rest of the grapes we have into apple-grape juice using our little cider press.  On the other hand, wouldn't it be so fun to just let the kids mash them all up with their feet?  I'll let you know how that goes...