• Links- Ruby Language

Jan 31 2009: ruby-lang.org has released the first production version of Ruby 1.9, some bugs and problems with gems, also see Ruby 1.9.1 Released - Fastest Ruby Ever.
Updated Dec 14 2008: link for Ruby Shootout.

Some useful links.

Some good advice from railshosting.org about setting up Rails in a shared hosting environment, and Rails hosting in general.

See plans for RailsPlayground ( level 2 is about $100 per year ). 

Ruby IDEs

Jan 31 2009, added EasyEclipse and RDE

Definitely recommended is EasyEclipse for Ruby and Rails. It is an easy and reliable all-in-one type package that will co-exist with other installations of Eclipse environments. The EasyEclipse for LAMP version ( > 150 Meg ) comes packaged with Python and PHP. Some of the versions of the components may not be the latest, but it's a good common IDE for both Windows and Linux ( and maybe the Mac too ? ).

Some of the plugins are similar to others, such as the Eclipse IDE for Ruby ( Windows only ), I don't understand the relationship between RadRails on Sourceforge.com and the RadRails Eclipse Plug-in by Aptana.com - they are related somehow. The EasyEclipse package takes care of all that anyway, so it's a moot point from a IDE user perspective.

Also notable is RDE ( Ruby Development Environment ) for Windows. It is compiled and has the advantage of being much lighter weight than EasyEclipse.

Eric4 has some Ruby capabilities, but seems to be primarily a Python IDE. I'm not 100% sure I have it configured correctly - will need to revisit.

Also see NetBeans based on for Java with an interesting IDE for Ruby and many other languages, especially since the arrival of JRuby on the scene.