Tastypie
Tastypie is an webservice API framework for Django which implements a REST style architecture.
Links
Alternatives
http://django-rest-framework.org/ According to a Dutch Django meeting in Amsterdam, Django Rest Framework is a better api than django-tastypie
Learning
Filtering
Sample
sample/python/django/sample_tastypie/
Testing
This looks like a useful Chrome add-in: http://www.getpostman.com/