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The Jekyll wiki at github and the example pages there provide quite a lot of useful examples including plugins such as SASS and HAML compilers, category archives or comments (using Disqus)

If you want to tinker with Jekyll more, I would recommend looking into Octopress, which is a blogging framework based on Jekyll, that offers a lot of advanced features and plugins not available in plain Jekyll...

[octopress]: http://octopress.org/

Not a big fan of Disqus here, same goes for using Facebook comments.

Thanks for the Octopress suggestion.

I used Jekyll. It's static content machine and I loved it. I now use nanoc. It's the same principle but I think it's better. I don't think that there are any books about Jekyll, but you can google around for basic tutorials.

How do you handle user comments ?

http://jekyllbootstrap.com

Ask HN: Blogging with Jekyll