Using Cloud Formations at AWS is an incredible way of building repeatable infrastructure, learn more about how it works and get to know cfn-bridge as well, a gem that aims to fill in the gaps not covered by the Cloud Formation API yet.
If you have to handle various ruby projects with various different rubies and you don't want to go crazy managing the dependencies, you should start using read this tutorial and start using RVM. If you don't have this need yet you should also read it as RVM makes playing with new and different rubies and gems a breeze!
If you're looking for a better way to search your application's text and knows that relational databases usually can't handle the job, Solr and Sunspot are here to help you. In this simple tutorial you'll learn how to use Solr and Sunspot to add real world full text search to your Rails applications.