$ gem install jekyll

$ mkdir myblog
$ cd myblog
$ touch index.html
$ mkdir _site _layouts _posts
$ mkdir css

$ gem install rack-jekyll
$ vi config.ru

# config.ru
require 'rubygems'
run Rack::Jekyll.new

$ echo 'rack-jekyll' > .gems

$ tree
.
|-- .gems
|-- _config.yml
|-- _layouts
|   |-- default.html
|   `-- post.html
|-- _posts
|   |-- 2011-03-24-my-first-post.markdown
|   `-- 2011-03-25-my-second-post.markdown
|-- _site
|-- config.ru
`-- index.html

$ jekyll --server --auto

$ jekyll --server --auto
$ heroku create myblog
$ git add . 
$ git commit -a -m 'my blog first commit.'
$ git push heroku master