Nice Nokogiri tutorial
I stumbled upon a nicely written entry-level tutorial about nokogiri, giving a clean, plain language explanation of the basic gem functionality and methods. The article is part of The Bastards Book of Ruby.
We... saw how to use the web inspector to intercept raw data files. This allows
us to read from them directly rather than deal with the data in HTML format...
But there will be many instances when you'll need to parse raw HTML. The
Ruby gem Nokogiri makes reading raw HTML as easy as crack-parsed XML