I have been lurking on this board for a long time and i'd like to thank you guys for sharing some great tips and information. That said, i thought i'd add my contribution to this thread.
I have been doing pull ups for years; i love them! i have done all kinds of grip variatons. Just recently i found i could not do wide grip pulls without getting a shooting pain in my right shoulder. Sounded like rotator cuff to me. Anyway, i did a basic search for 'pullups' and on one of the sites i found, i read that pull ups should first and foremost be done with palms facing away...fair enough...i prefer those anyway. The bit that really got my attention was that pulls should ALWAYS be done with the grip no wider than shoulder..narrower if possible, because the wider the grip, the more strain placed on the rotator cuff. Also, with a wide grip, motion is restricted placing more stress on the cuff. It was often believed that a wide grip pull up would widen the outside of the Lats....apparently (according to the webpage) this is not so, and the grip will make no difference to Lat development. I don't know if any of that is true.....i DO know i cannot now do wide grip pulls, but i'm content with a standard shoulder width grip...with weights. Do you think there is too much information on the net? it can be very ambiguous......!