Ruby on Rails introduction for newbies

For newbies like me, here is a good introduction article on ruby on rails. At my work place, we had a training class from Spring Source in which the trainer mentioned that using Ruby on rails, we can build a simple website in a day. However for high volume applications, this is not a solution.

http://www-128.ibm.com/developerworks/java/library/wa-rubyonrails/