For me, it all depends on the plum. I can sit and eat greengages or Italian prunes all day, and I even loved them when my grandma canned them. Mirabelles aren't bad; I freeze them when people hand me sacks of them, and bake them in a crumble in the winter. But the red ones with the clingy seeds make good compost. Or maybe sauce, nice idea, Snagg; you could cook it up and freeze it for cold-weather roasts. Fortunately I don't know anyone who grows them.
Try the crumble, Stir; it improves a lot of fruits.