we cut ours in half and freeze them on flat trays then decant them into big freezer bags to use as we wish throughout the year. Much easier and less 'not plums again' than trying to use up quickly as they ripen.
tdonb can you give me recipe/links to recipes, esp the boozy compote... my fingers have been badly stained due to my attempt to deal with the fruit of 5 plum trees, this is my first year of plum preserving/cooking
if you have too many why not bag some up and leave outside your gate with a note saying fresh plums please help yourself or charge a small amount for them(some people would rather pay something).
You might have some neighboughs who love plums and want some with a smaller carbon footprint