Perhaps one of those "slap-chop" things? Oxo, Pampered Chef, etc. make them. Or maybe a mezzaluna - get one with the bowl.

How about kitchen shears/scissors? Instead of using a knife, I have a bunch of things I like to cut with my SoftWorks Stainless Steel OXO Scissors (they come apart at the hinge for easy cleaning or sanitizing in every nook and cranny).

Put a handful of cherries in a 1-cup glass measuring cup (or other container) and snip away. I use this method when I need to cut dried cherries into smaller pieces.

-Grainlady

If you have a sharp knife, use that. It's fast, and you'll have better control with a knife than you would a FP.

Sol

Get a small electric food processor, a.k.a. food chopper- Wal-mart has a variety of them, as do other box stores, even the local drug store surprisingly. They don't hold much but you will have better control of how much chopping you want done. It is still easier than one by one with a knife, for sure.
Another choice is the "onion chopper" that is manual (slam it) but I use it for lots of fruits and vegetables for "finely chopped" .
Nancy

Here is a link that might be useful: Wal-Mart Food Choppers

I'm not sure it would matter the method to get the pieces chopped when you are just making jam with cherries. But maybe you need a new, sharper blade? My Cuisinart chops finely with no tearing at all; smaller batches seem to make it easier to get uniform pieces, but with jam you might want some variation in size so you get some chunkier bits?

I make cherry jam every year from sour cherries, and I chop them in my food processer after they are pitted.
Since you have so many cherries,( jealous) make sure you process them in batches and take care not to over process.