TextMate on OS X has long been the favored Rails editor, but the classic editors are still going strong. See VIM for Rails and Emacs for Rails.

For a full-on IDE, check out RadRails, RubyMine, 3rd Rail, or Netbeans for Ruby.

Rails is blessed with not one but three startups dedicated to helping you track and improve the performance of your applications: FiveRuns, New Relic, and Scout. Any high traffic Rails application should use one of these.

While Rails hosting is now common place, there's a handful of dedicated Rails hosting companies that have been around for a long time and supporting the community: Rails Machine, Joyent, Brightbox, Planet Argon, and Engine Yard. If you're just looking for a VPS, we recommend Slicehost or Linode.

Lots of Rails consultants stand ready to help develop your application or train your team. Koz and Pratik from core work individually and we all like the teams from entp, Thoughtbot, Pivotal Labs, InfoEther, Fingertips, and Hashrocket. You can find even more consultants at Working with Rails.

RailsConf is the official yearly Rails conference, but there are also a bunch of regularly regional ones too: Paris on Rails, Scotland on Rails, Conferencia Rails, Rails Summit Latin America, Locos X Rails. To learn about upcoming workshops, see the workshop calendar.