# search/admin.py
from django.contrib import admin
from django.contrib.flatpages.admin import FlatPageAdmin
from django.contrib.flatpages.models import FlatPage

from mysite.search.models import SearchKeyword

class SearchKeywordInline(admin.StackedInline):
    model = SearchKeyword

class FlatPageAdminWithkeywords(FlatPageAdmin):
    inlines = [SearchKeywordInline]

admin.site.unregister(FlatPage)
admin.site.register(FlatPage, FlatPageAdminWithkeywords)

# search/models.py
from django.db import models
from django.contrib.flatpages.models import FlatPage

class SearchKeyword(models.Model):
    keyword = models.CharField(max_length=50)
    page = models.ForeignKey(FlatPage)

    def __unicode__(self):
        return self.keyword