Disqus for commments and a license
Update: I’m not using Disqus for comments anymore, see Why you should quit disqus
I’m using Disqus for comments. To set it up edit the conf.py in blog root, search for disqus. The shortname is put in COMMENT_SYSTEM_ID. While I was setting up comments I found a section for license. Check out Creative Commons Chooser to help select an appropriate license. I chose this one non-commercial share alike