willo.gd/en

After much searching and trying out various different syntaxes, I finally found the following which allows a boolean field to be rendered as radio buttons. This has been tested in Dango 1.4. I think a few of the StackOverflow answers related to this are for older versions of Django:

class MyForm(forms.Form):
    my_boolean_field = forms.BooleanField(widget=forms.RadioSelect(choices=((1, "Yes"),(0, "No"))), initial=0, required=False)