Developing Developers - Linkspams from the wider d

Ruby:

Joining elements of an Array to a String
http://rubyquicktips.tumblr.com/post/966804843/joining-elements-of-an-array-to-a-string
Ruby helps you do simple tasks easily and with less code.
level: basic

Ruby Tips Series
http://mashable.com/tag/ruby-tips-series
Tips from the experts on how to get-going or keep moving with Ruby & Rails.
level: all

Ruby 1.9 features, tips & tricks you may not know about...
https://gist.github.com/809804
Some new features for ruby 1.9
level: intermediate

Programming Ruby 1.9 excerpt about Regular Expressions
http://media.pragprog.com/titles/ruby3/ruby3_extract_regular_expressions.pdf
An entire chapter on regular expressions in ruby 1.9 for free.
level: basic & intermediate

Rails:

Development for Designers
http://intridea.com/posts/development-for-designers
A basic introduction to getting started developing for designers.
level: basic

Working with the flash hash
http://travisonrails.com/2008/08/17/Working-with-the-flash-hash
How to use rail's flash hash.
level: basic

Notifications in Rails 3
http://railscasts.com/episodes/249-notifications-in-rails-3
Notifications help to isolate certain logic out of models where it doesn't belong.
level: intermediate

Gem: CIJoe
https://github.com/defunkt/cijoe
A basic but useful continuous integration setup.
level: intermediate

Cucumber:

(My) Cucumber best practices and tips
http://eggsonbread.com/2010/09/06/my-cucumber-best-practices-and-tips/
This article will help you organize, clarify and reduce the size of your cucumber scenarios.
level: intermediate

Bundler:

Bundler Pro Tips
http://www.engineyard.com/blog/2011/bundler-pro-tip/
Some tips & tricks for using bundler, not just on rails! There are a good selection of tips, some are a bit more advanced than others.
level: basic & intermediate

Git:

the staging area
http://gitready.com/beginner/2009/01/18/the-staging-area.html
Some information on git staging for folks new to git.
level: basic