Re: weight training in boxing...
weight training is good if done the right way, it should be a supplement to your boxing training, so it should be done maximum 2 or 3 times a week,
work on compound lifts (deadlifts, bench press, squats) and forget the isolation movements such as bicep curls and machines, work with heavyweights with 3-5 reps for strength 4-6 reps for power 7-12 reps for hypertrophy (bulking) and 12+ for endurance
once you master the basic lifts you can then move onto the more harder olympic lifts such as clean and jerk or clean and press,
as for boxers who lift weights there are evander holyfield, kostya tszyu, kelly pavlik, shane mosley and alot of others.