I've been using Fish on my Mac for a while as well as some VPS' I have. At work I just installed it on our dev server.

It has a build in git status script you can include in your prompt that's awesome. Here's my fish prompt (note __fish_git_prompt):

    function fish_prompt
      set last_status $status

      set_color $fish_color_cwd
      printf '%s' (prompt_pwd)
      set_color normal

      printf '%s ' (__fish_git_prompt)

      set_color normal
    end

Sample:

   ~/G/Calendar (branch_name * ↩ =)