List of Users online

I want to list the logged in users on my index page and was wondering
what was the right way to do this.

Can I do it similar to this ?
def index(request):
return render_to_response('index.html', {
'online_users': User.objects.filter(last_login > delay)
})
delay being "now - 15 minutes" or something like that...

Is there a way to use is_authenticated() in that context ?
Should I use a MiddleWare instead to acheive this ?

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