cat site/register/forms.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from registration.forms import RegistrationForm
from django import forms
class UserRegistrationForm(RegistrationForm):
    #unique_id = forms.CharField(min_length=12,max_length=12,label=("Unique id"))
    user = models.ForeignKey(User, unique=True)
    url = models.URLField("Website", blank=True)
    company = models.CharField(max_length=50, blank=True)
settings.py
AUTH_PROFILE_MODULE = "account.UserProfile"

./manage.py shell
Python 2.7.3 (default, Mar 22 2013, 00:04:12)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from registration.forms import RegistrationForm
>>> f =  RegistrationForm()
>>> print f
<tr><th><label for="id_username">Username:</label></th><td><input id="id_username" type="text" class="required" name="username" maxlength="30" /></td></tr>
<tr><th><label for="id_email">E-mail:</label></th><td><input id="id_email" type="text" class="required" name="email" maxlength="75" /></td></tr>
<tr><th><label for="id_password1">Password:</label></th><td><input id="id_password1" type="password" class="required" name="password1" /></td></tr>
<tr><th><label for="id_password2">Password (again):</label></th><td><input id="id_password2" type="password" class="required" name="password2" /></td></tr>