Blog I created as a part of Udacity's Web Development course in Python using Goggle App Engine framework
You can see the live working version of it at "mithunnallu-webdev.appspot.com/blog".
You can deploy this as a Google App Engine application and this blog resides at "<YOUR_APP>/blog." The homepage of this blog shows the top 10 latest blogs posted You can add a new blog by visiting "<YOUR_APP>/blog/newpost" You can click on any blog entry to visit its details page where I recently integrated with disqus to facilitate commenting
This blog also supports returning data in json format for someone to query and use. The json query urls are "<YOUR_APP>/blog/.json" to view all blogs data in json format and "<YOUR_APP>/blog/<BLOG_ID>.json" to get the json data of this particular blogid in json
There is also a user sign up and login features I developed but not integrated with the blogging system. One can extend this user creation to the blogs feature thereby keeping track of what users posted what. A working Sign up page is available at "<YOUR_APP>/blog/signup" and login is available at "<YOUR_APP>/blog/login"
Good luck!