My friend Josh over at Unconventional Marketing just pinged me via GoogleTalk on how to redirect your web site visitors based on IP address. Well, I figure this might be great information for others as well so I found a solution.
This method will work well because you can redirect single web pages using PHP instead of using .htaccess. I think php files are a lot more versatile and useful anyways.
Redirect based on domain:
<? $ref