On Sep 12, 5:33   𮮮 
> Platform: Windows XP 32-Bit.
> Preliminaries: Fresh Ruby install (Ruby 1.9.2-p0 Binary).
>
> After running 'gem install nokogiri' (any other gem can be chosen) the
> $LOAD_PATH remains unchanged.
> Unlike Ruby 1.9.1, the $LOAD_PATH is first populated with the
> gem-specific paths after a 'require "nokogiri"'.
>

What you;re mentioning is a bug in 1.9.1 bundled RubyGems, which has
been corrected in 1.9.2

> Since Rubygems doesn't intercept autoloading, the following snippet
> fails on Ruby 1.9.2:
>
> autoload :Nokogiri, 'nokogiri'
> Nokogiri
>
> autoload_fail.rb:2:in `<main>': no such file to load -- nokogiri
> (LoadError)

Do not use autoload to load code from gems, or at least use "gem
'nokogiri'" to indicate you're going to use it.

See the list of changes and the full changelog of Ruby 1.9.2 for
details on gem_prelude changes and associated bugs.

--
Luis Lavena