Lat Science: Exploring the Pullup
It's a good article on pullups, although the font and font size made my eyes ache until I zoomed in a bit more.
I especially like the bit about saving a few extra reps in the tank - no going to failure - to maintain "a feeling of confidence and master". I like that a lot. If you leave every session at the gym feeling like you dominated a given exercise, I feel like your progress in it will be superior to leaving it feeling drained and beaten. Confidence matters!