Most of these projects require app-engine-patch:

• Jaiku ported to app-engine-patch
• Gaebar: Backup and restore utility for datastore
• Rafał Jońca's blog
• ihere: Another blog
• django-registration: user registration support
• FirePython: log directly to Firebug
• Gaegene: Useful snippets
• authopenid: port of Django's OpenID app
• OpenID: support for OpenID
• gae-django-dbtemplates: render templates from the datastore