I'll add a couple of my favorites, as well:

    glog = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'
    stash-all = stash save --include-untracked
    update-fork = "!f() { git pull --rebase upstream $1 && git push origin $1; }; f"