put this in your .bashrc/.bash_profile... works with both git and svn

pimp_prompt.sh

parse_git_branch() {
  ref=$(git symbolic-ref -q HEAD 2> /dev/null) || return
  printf "${1:-(%s)}" "${ref#refs/heads/}"
}

parse_svn_revision() {
  local DIRTY REV=$(svn info 2>/dev/null | grep Revision | sed -e 's/Revision: //')
  [ "$REV" ] || return
  [ "$(svn st)" ] && DIRTY=' *'
  echo "(r$REV$DIRTY)"
}

pimp_prompt() {
  local        BLUE="\[\033[0;34m\]"
  local   BLUE_BOLD="\[\033[1;34m\]"
  local         RED="\[\033[0;31m\]"
  local   LIGHT_RED="\[\033[1;31m\]"
  local       GREEN="\[\033[0;32m\]"
  local LIGHT_GREEN="\[\033[1;32m\]"
  local       WHITE="\[\033[0;37m\]"
  local  WHITE_BOLD="\[\033[1;37m\]"  
  local  LIGHT_GRAY="\[\033[0;37m\]"
  case $TERM in
    xterm*)
    TITLEBAR='\[\033]0;\u@\h:\w\007\]'
    ;;
    *)
    TITLEBAR=""
    ;;
  esac
#PS1="${TITLEBAR}[$WHITE\u@$BLUE_BOLD\h$WHITE \w$GREEN\$(parse_git_branch)\$(parse_svn_revision) $RED\$(~/.rvm/bin/rvm-prompt v g)$WHITE]\$ "
PS1="${TITLEBAR}[$WHITE\u@$BLUE_BOLD\h$WHITE \w$GREEN\$(parse_git_branch)\$(parse_svn_revision)$WHITE]\$ "
PS2='> '
PS4='+ '
}
pimp_prompt

two things.
1. Would recommend against 'function'. not as portable.
2. I use this for my parse_git_branch

__git_ps1() {
    ref=$(git symbolic-ref -q HEAD 2> /dev/null) || return
    printf "${1:- (%s)}" "${ref#refs/heads/}"
}

then I use __git_ps1 in my PS1. This has the added benefit that if I use git-bashcompletion, it provides __git_ps1 which will override my declaration, and gives a more robust ps1 (handles some edge cases).

Cactus, thanks for the notes. Do you have a gist of all your code somewhere?

I am putting this here from my own use as well as others... not entirely sure what the small differences are here: http://en.newinstance.it/2010/05/23/git-autocompletion-and-enhanced-bash-prompt/

autocompletion? This is relevant to my interests...