Gary Bernhardt. He does a great job at teaching Vim/Bash/Git workflow in his screencasts, which is typically something that's hard to learn on your own. I remember my mind getting blown when he did this in vim `:nmap ,t :w\|:!clear && ruby %<cr>` (if you don't use vim, this remaps comma-t to run the current ruby file you're editing). I still use that little trick all the time and it always amuses my friends.