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Yes Jeff, weight lifting is good for you if you follow proper form as MoBlo said (for your joints). Weight bearing exercises (like weight lifting, yoga, pilates) strengthen the musculoskeletal system since stronger muscles necessitate the need for stronger bones. This is why when women have osteoporosis, they recommend they do weight bearing exercises as it spares calcium.

That being said, being a bodybuilder can have the same detrimental effects as being overweight. When a bodybuilder is 5'8" and weighs 200lbs, the heart still has to work hard to pump blood to all needed areas and if cardio isn't done, the heart is going to be very ineffective at doing this, BP will go up, etc. Also, if a bodybuilder is consuming mass amounts of meat, even if they are lean cuts, they are still getting lots of cholesterol and saturated fat (which is more dangerous for your cholesterol levels than actual dietary cholesterol), which can cause heart damage and clogged arteries. Also, the excess protein causes a significant demand on the kidneys because they pretty much OD on it and think you need 2g/lb of body weight, when it is really .8g/kg of body weight for maintenance and 1.3-1.5g/kg of body weight for growth. Any more can cause metabolic alkalosis and can alter blood pH from excess protein and if enough water isn't taken in, it can cause kidney stones due to the kidneys have to produce mass quantities of concentrated urine due to increased metabolic urea (waste product of amino acid metabolism).

Also, casein (in milk) is beginning to be implicated in cancer and associated with ADD and ADHD. Casein and whey are the two types of protein in milk; casein is the slow digesting one. People think eating this before sleep is good because it will provide protein throughout the night; this may work in theory, but the longer things sit in your digestive tract, the greater the chances of colon cancer or developing ulcerative colitis.