Another fundamental reason why I'm currently learning Rails and probably going to switch 100% for my projects is a little something called
Heroku. You see, Heroku is changing the world of hosting just like Rails did. You don't have to worry about anything now, absolutely nothing. Push your changes and heroku will handle everything. Every single platform wants a heroku. PHPFog for PHP, AppHarbor for ASP.NET MVC, EPO.IO (or something) for python ... all are following the heroku path and it makes sense.