Beautifully simple. And thanks for the reminder about http://jekyllrb.com/ which seems like a cool blogging system...
On the theme itself, looks good. I like it.
For comments, is disqus the recommended solution? Does it slow down the system again with database calls? Security issues again?
I am also interested in having charts, but I presume integrating those would not be much trouble.
Thanks
Adding to the comment by tacticus about Disqus: It's the preferred solution for Jekyll sites since they are static. Disqus takes care of all the commenting heavy lifting on the client side, while also taking care of the database.