What are some alternative sources of calcium (to milk) for the lactose-intolerant?
Green vegetables are a good source of calcium, in particular, artichokes, broccoli, and greens (like turnip greens). Other sources of dietary calcium include sardines, canned salmon, raisins, almonds, sesame seeds, and soy beans. 

ETA: The daily recommended intake of calcium for an adult is 500-1000 mg. If you're curious about how much calcium a particular foodstuff has, you can look it up on the USDA National Nutrient Database.