Octopress does a great job in setting you up to use heroku to host your site. Details for the almost trivial set up can be found here. To summarize, after installing and setting up Heroku, create a Heroku repository as per usual:

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heroku create

Edit the .gitignore file and remove public so that the it is included with git changes and then run the following:

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rake generate
git add .
git commit -m 'site updated'
git push heroku master

You will need to run the above every time you add a new post so to make things easier, you can add a rake task to the Rakefile to handle the less exciting bits for you. Mine looks like:

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desc "Deploy website via Heroku"
task :heroku, :commit_message do |t, args|
  if args.title
    message = args.commit_message
  else
    message = get_stdin("What updates are you pushing? ")
  end

  Rake::Task[:generate].execute

  puts "## Deploying website via Heroku"
  system "git add ."
  system "git commit -m \"#{message}\""

  puts "## pushing updtates: head ---> origin"
  system "git push origin head"

  puts "## pushing updtates: master ---> heroku"
  system "git push heroku master"
end

And with that, all I have to do new after editing or creating a post is simply run:

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rake heroku

And life is good.