A django-cms plugin that displays the last number of posts of a tumblr user.
This plugin could use a little more fleshing out, but what's there is solid and done properly. It retrieves tumblr data from tumblr's v2 API. It uses only the /avatar and /posts methods, thereby avoiding the complexities of oAuth (and the other methods don't really make sense in the context of a CMS plugin anyway). The data returned by the tumblr API are documented at http://www.tumblr.com/docs/en/api/v2/.
Feel free to email me with questions / feature requests.