<p>So I've been using InstantRails to check out Ruby on rails. I've been using Notepad++ for the editing. Now I don't want to install Ruby or Rails on my machine. Is there any walk through/tutorial on how to integrate Radrails or Netbeans with InstantRails? </p>

Here's a tutorial:
http://ruby.meetup.com/73/boards/view/viewthread?thread=2203432
(I don't know if it's any good.)
And here's one with InstantRails+Netbeans:
https://web.archive.org/web/20100505044104/http://weblogs.java.net/blog/bleonard/archive/2007/03/instant_rails_w.html