Nested inlines in the Django admin?

Alright, I have a fairly simple design.

class Update(models.Model):
    pub_date = models.DateField()
    title = models.CharField(max_length=512)

class Post(models.Model):
    update = models.ForeignKey(Update)
    body = models.TextField()
    order = models.PositiveIntegerField(blank=True)

class Media(models.Model):
    post = models.ForeignKey(Post)
    thumb = models.ImageField(upload_to='frontpage')
    fullImagePath = models.ImageField(upload_to='frontpage')

Is there an easy-ish way to allow a user to create an update all on one page?

What I want is for a user to be able to go to the admin interface, add a new Update, and then while editing an Update add one or more Posts, with each Post having one or more Media items. In addition, I want the user to be able to reorder Posts within an update.

My current attempt has the following in admin.py:

class MediaInline(admin.StackedInline):
    model = Media

class PostAdmin(admin.ModelAdmin):
    inlines = [MediaInline,]

This let's the user add a new Post item, select the relevant Update, add the Media items to it, and hit save - which is fine. But there's no way to see all the Posts that belong to a given Update in a single place, which in turn means you can't roderder Posts within an update. It's really quite confusing for the end user.

Help?