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ViM - Vi iMproved
Arachno IDE
RadRails
jEdit Ruby Editor
Instant Rails
TextMate
Writeboard
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Ruby on Rails
Ruby on Rails VPS Hosting by eApps - www.eapps.com
ROR Cloud hosting Network by Mosso - www.mosso.com
Applications hosting by Rackspace - www.Rackspace.com
Affordable Ruby On Rails Hosting by FiveRuns - www.FiveRuns.com
Grid Technology based ROR Webhosting by GoGrid - www.GoGrid.com
Managed Rails Hosting by EngineYard - (www.engineyard.com)
Very cheap RubyonRails Hosting by DailyRazor - www.dailyrazor.com
Both have their advantages, choose PHP if you want to deploy code choose rubyonrails if you want run software as a service
Ruby on rails is solid framework and is more modern than PHP
PHP is better as it is highly flexible and is not convention based
Locomotive has support for ruby on rails 2.1
Locomotive has stopped support and is not available for rails 2.1
Ruby on rails developers are available in plenty
Ruby on rails developers are very rare