If you have ever had a "Linzer Tart"? You know, the shortbread type cookie with tart raspberry jam covered in powdered sugar? Then you have likely tasted quince jam. Most bakeries combine the raspberry and quince preserves for the filling. It's one of my favorites.
I just told my roomie that I was reading about quince and he told me that Pepperidge Farms "Linzer Tart Cookies" were on sale this week. I'll check out the ingredient list to see if they use quince in their recipe -- likely not, though. It's a huge cost-cutting conglomorate now (I think owned by Campbell's Soup).
They do, however, have quince jam in a round flat container in the ethnic foods aisle, likely imported from Spain. I may try it with some good smelly cheese because I usually like that sort of thing!