re: Can you Roast a Boston Butt in a crockpot?

Yep. It's almost a cut of meat that's perfect for a crock pot. Agree on the greasy part as you need to pick around it if you're going to eat it right away. If you're eating the next day, you simply spoon the cold fat off.

On a side note, I was shocked to know that you can cook meat in a crock pot without covering with liquid. For instance, season some baby backs as you would, then simply put them in an oiled crock and go for 8 hours. You'll get a surprising result.