Supposedly they're great for stuffing, tho I have yet to find a stuffed zuch recipe that really appeals to me. They slice up just fine, though if you want the smaller pieces you can slices the slices into wedges. I ran most of mine through the food processor and shredded them for frying and baked goods.
I wonder if spaghetti squash are easy to grow...I've never done any squash other than zucchini and I have no idea if they're all pretty easy or what.