You know what we do with leftover spaghetti? We have FRIED spaghetti! Man, now that is good. My mother used to make it all the time when I was a kid with the leftovers but I totally forgot about it until about 5 years or so ago.
It really isn't that hard, just mix together the leftover sauce and spaghetti, add a little canola or olive oil to a large skillet and heat to medium high or high and add the mixture. Constantly break up with a spatula, and press on to the pan. Flip it over every, say 4-5 minutes when it darkens on one side and repeat that for about 15 minutes or so. You want it chopped up pretty good, almost a long rice size. You also want it to crust up each time you flip it. Break it up with each flip. Makes a great meal or side dish.
Oh yeah, I wrote this down on my site back in March 07:
Jeffs Recipes ยป Leftover Feast: Fried Spaghetti