Handrail Benders
Offers site rails, wall rails, stair rails, and guard rails.
http://www.handrailbenders.com

Ruby for Rails: Ruby Techniques for Rails Developers
Ruby for Rails by David A. Black gives would-be Rails developers an understanding of what they're actually doing when they write a Rails web app. It shows how Ruby techniques expand the horizons of what can be done in Rails
http://www.manning.com/black/

The Rails Way
Core Rails committers answers user submitted questions about Rails.
http://www.therailsway.com/

Riding Rails
Official Ruby on Rails team group blog; essential for learning of security updates, and overview of full Rails community.
http://weblog.rubyonrails.org/

ELB, Inc.
Manufactures Spin Rails and Reactor Rails, which are both skateboarding grind rails.
http://www.elbinc.com

Tubular Specialties Mfg., Inc.
Manufacturer of component and custom railing systems, handrails, guard rails, picket/panel rails, glass rails and architectural metal work.
http://www.calltsm.com/

Pacesetters Systems Inc.
Quick die change and rolling systems - Hydraulic, Mechanical, and air powered
http://www.pacesettersystems.com/

Ashland Conveyor Products
gravity & power conveyors, skatewheel, roller, & ball conveyors, conveyor parts & accessories, ball transfer tables, conveyor supports & stands, telescoping, incline & belt conveyor, H-stands & tripod , gravity & power conveyors, skatewheel, roller, & ball conveyors, conveyor parts & accessories, ball transfer tables, conveyor supports & stands, telescoping, incline & belt conveyor, H-stands & tripods, flow rail, - Ashland Conveyor Products
http://www.ashlandconveyor.com/

Distributing Rails Applications
How to turn Rails programs into standalone programs, via Tar2RubyScript and RubyScript2Exe; not the proper way to deploy Rails programs on production servers; by Erik Veenstra.
http://www.erikveen.dds.nl/distributingrubyapplications/rails.html

Rails PRO Forum
Deutschsprachiges Ruby on Rails Forum mit integrierter Jobbörse für Rails-Projekte.
http://www.rails-pro.de