Mmmm... pork shoulder, one of my favorite cuts, so flavorful. If If I don't have a lot of prep time but plenty of cook time (ie. any weekday) I'll put a rub on the pork shoulder the night before, then in the morning, drop it in a crock pot with a bit of white wine, worchestire (sp?), vinegar of some sort, some sliced onions and let it cook on low all day (~9 hrs) while I'm at work. Then when I come home I can just pull it apart with a fork and put it on a sandwich or cous cous or whatever starchy thing I feel like having with it that night, maybe with a side of steamed broccoli (but then, I could eat steamed brocc with just about any meal, I'll even eat it as a midnight snack).
Now if I have bit of prep time and am able to keep an eye on the cooking, I make carnitas. Cube up the shoulder, drop it in a big pan, cover with water and a bit of salt and cook low and slow for about 3 hours or until all the water is gone, then keep cooking until browned. Take out the meat, cook some onions in the fat in the pan, add back the meat and season to taste. Drop it in a tortilla, add whatever you like, I like mine with a little lettuce, tomatoes and fresh home made salsa.
