Acorn squash is great as is, roasted until tender and topped with butter and something sweet, like maple syrup, or brown sugar. Honey also works well. The squash can also be eaten savory with just salt and pepper. You can cut the squash in half, remove the seeds, and nuke in the microwave until tender as well.
My mother used to stuff her squash with a meatloaf mixture and serve with ketchup. I've stuffed with a meat and rice mixture, with gorund beef and cranberries, buttered the inside and rubbed in a mixture of brown sugar, cinamon, nutmeg, and ginger. I've also made squash soup with acorn squash. You can even peel it, and bake with butter and pecans.
Acorn squash is slightly sweet, with a complex flavor that compleiments most meat, and many veggies. You might try making a casserole of acorn squash, cubed pork, and onions. Or, add some acorn squash cubes to your next New England Boiled Dinner. That would be very good.
Hope this helps.