ForeignKeyChoiceField

When you have a formset that has a foreign key, Django will fire off a new (identical) query to build the choices for that field for each form in the formset by default. Using this field will allow you to run the query once for the choices and re-use that queryset for each form in the formset.

CommaSeparatedField

Django has a comma separated integer field, but not just strings. Stupid, I know... we created one for use with strings

QuerysetChoiceField

When you want to build a select box with a queryset but don't want a model instance when saving, use this thing.

FormSetView

Django 1.3's generic views do not include a FormSet view. That's what this is.