I also had a pair of plum trees out in Oregon. You kind of have to do something if you have plum trees. I got a dehydrator for prunes (which, for whatever reason didn't turn out that good, no amount of drying kept them preserved. You could eat them, but by the time you finished them off they were starting to get pretty sour) and made plum butter, which was amazing and I never needed to buy jam for years, and plum wine, which was also quite good. I need to get a plum tree to do it again--even though pitting the bastards was a miserable chore. Actually 2, maybe, because I've heard they aren't self-germinating.