--- models.py ---

class Feedback(models.Model):
    user = models.ForeignKey(User)
    comment = models.TextField(verbose_name=_('Feedback / Comments'))

    def __unicode__(self):
        return str(self.user)


--- forms.py ---
from models import Feedback
from django.forms import ModelForm
from django.contrib.auth.models import User

class FeedbackForm(ModelForm):
    def __init__(self,theUser,*args,**kwargs):
        super (FeedbackForm,self ).__init__(*args,**kwargs) # populates the post
        self.user = theUser
        self.instance.user = user

    class Meta:
        model = Feedback
        fields = ('comment',)


--- views.py ---
def feedback(request):
    theUser = request.user
    if request.method == 'POST': # If the form has been submitted...
        form = FeedbackForm(theUser,request.POST) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
            form.save()
            return HttpResponseRedirect('/thanks/') # Redirect after POST
    else:
        #usrFeedback = Feedback.objects.filter(user=request.user)[0]
        #form = FeedbackForm(request.POST,instance=usrFeedback) # An unbound form
        print request.user
        form = FeedbackForm(theUser) # An unbound form

    return render_to_response('feedback.html', {
        'form': form,
        'user': request.user
    })