# Your custom panel

from debug_toolbar.panels import DebugPanel
from django.utils.version import get_svn_revision
import os

class CustomVersionDebugPanel(DebugPanel):
    """
    Panel that displays your project svn version.
    """
    name = 'your_site'

    def title(self):
        return 'your_site_name %s' % ( get_svn_revision(path=os.getcwd()))

    def url(self):
        return ''

    def content(self):
        return ''


# settings

DEBUG_TOOLBAR_PANELS = (
        'base.debugpanels.CustomVersionDebugPanel',
        [...]
)