Install Homebrew
Full install instructions are available here: https://github.com/mxcl/homebrew/wiki/installation
ruby -e "$(curl -fsSLk https://gist.github.com/raw/323731/install_homebrew.rb)"
Install Git
brew install git
Enable Bash Completion
cp /usr/local/etc/bash_completion.d/git-completion.bash ~/.git-completion.sh
Add the following to ~/.profile
source ~/.git-completion.sh PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
It helps me a lot! Thanks!