I was pretty surprised to find the Ruby article article featured at perl.com, but thinking again it isn't such a surprise: O'Reilly has to sell its Ruby in a Nutshell, and outside of Japan Perl programmers are probably the main audience for such a book.

Unfortunately the O'Reilly article missed one of the most important sources for Ruby beginners:
There is allready the Programming Ruby book published by Pragmatic Programmers. You can read the whole book in html here.
So just download Ruby and/or read the free book to get a feeling about Perls little brother.

Hanamaki