Ok.. so now I'm getting somewhere. After much trial and error I finally figured out that I need to run:
sudo a2enmod proxy
sudo a2enmod proxy_http
To enable the proxy function in my apache server. Once that is done, it seems the rules given at the first website is not really correct. So in the end my .htaccess contains the following:
RewriteRule ^(.*)$ http://localhost:8080/$1 [P]
But even though that is all fine and dandy, it didn't allow me to surf to more than the front page. All the subsequent links in the page was broken. And I experimented some more until finally I've got it at:
RewriteRule ^(.*) http://localhost:8080/VirtualHostBase/http/abdullahsolutions.com:80/VirtualHostRoot/_vh_plone/$1 [P]
Read the first article and it will mention about enabling Virtual Host Monster in the zope management page. But it did not mention about if you we're actually serving from a directory under your web root. Well, good thing the about page on the zope management page explained it all. So for the example above, my server was serving plone from the directory plone. The _vh_ tells the virtual host monster to append plone/ to every link it generates. Cool stuff..
So then I finally got it working. Alhamdullillah... Took a whole night. But seems to be very worth it.
Update (16 March 2008): Finally I've even got the layout working. After referring to http://matthewwhitworth.com/2008/02/06/escape-from-mod_rewrite/ and the Velo site it point to and also http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html#mapfunc which explains what RewriteMap actually does. The RewriteMap part has to be part of the http.conf or if you are using Ubuntu in the sites configuration file. Then escape the request just like it says in the matthewwhitworth site and it all should work. Finally.