RbWebKitGTK

These are usable bindings. There are still some methods missing 
from WebView, but you can use almost the whole API at this point.

To build:

  1. cd /path/to/rbwebkitgtk/
  2. export RG2_DIR=/path/to/ruby-gnome2-sources/; ruby extconf.rb
  3. make
  4. (as root) 
     make install 

To require:
  
  require 'webkit'

To use the WebView Gtk Widget:

  webview = Gtk::WebKit::WebView.new
  webview.open("http://www.example.com/")
   -or-
  webview.load_html_string("<h1>Hi!</h1>")

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This page sets out WebKit deps on ubuntu
http://packages.ubuntu.com/source/hardy/webkit

I've developing against nightly build WebKit-r31823 - dan