rewrite rule tutorial on ask apache I could not understand syntax

[Tapas Mishra <mightydreams@xxxxxxxxx>]

http://http://www.askapache.com/htaccess/crazy-advanced-mod_rewrite-tutorial.html

 is a link to a tutorial which mentions following use of ReWriteRule is wrong.

RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} !^www\.askapache\.com$ [NC]
RewriteRule .+ http://www.askapache.com%{REQUEST_URI}

I could not understand what is the mistake in the above rule?
Can some one point what is the error which the tutorial is trying to tell.

-- 
Tapas
http://mightydreams.blogspot.com
http://wiki.xensource.com/xenwiki/Xen_on_4_app_servers

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