I got tired of creating new Sinatra applications that use ActiveRecord. I know there are alternatives out there but I wanted something really bare bones that I can just clone and work from whenever I need it.
gem install sinatra activerecord sinatra-activerecord
It's basically setup to handle connecting to databases under various environments using ActiveRecord. I also installed the query_analyzer plugin since I use that all the time when I'm in development mode.
By all means, go ahead. Just send me a pull request so I can check it out when you're done.
The unicorn script is derived from the one that was on the github blog post here: http://github.com/blog/517-unicorn
The unicorn init.d script is taken right out of the unicorn gem itself. I forget if I hacked it up or not.