Lot's of Ruby and Rails Tricks
Quick, short post I always had in the queue:
Check this out, here some lists of good techniques to get started and to impove your Ruby and Rails code:
http://nettuts.com/articles/web-roundups/10-awesome-ruby-on-rails-techniques-to-get-you-started/
http://www.rubyinside.com/19-rails-tricks-most-rails-coders-dont-know-131.html
http://www.rubyinside.com/21-ruby-tricks-902.html
[Awsm picture taken from DesignShark]