As luck, or coincidence would have it, yesterday I did pullups as part of my lats workout. Here was the routine which I'm pretty proud of because it took about one year to work up to this:
SET ONE: 26 reps (weightless)
SET TWO: 13 x 25lbs (13 reps with a 25lb plate on a belt)
SET THREE: 18 reps
SET FOUR: 11 x 35lbs
SET FIVE: 15 reps
SET SIX: 10 x 45lbs
SET SEVEN: 18 reps
SET EIGHT: 9 x 55lbs
TOTAL REPS: 120
Although I suspect some of you may say this is excessive (and, by the way, I admit to taking breaks in between sets of up to five minutes), for the first time in my life, my lats are coming along quickly. So if it's not broke . . .