Redirecting user to there country site based on IP Address

You can do a soft redirect (i.e., after the page has loaded, redirect or tell them to “click here”): http://ellislab.com/forums/viewthread/161634/#784093

If you need to do a real redirect you’ll need access to the ip-to-country mapping (http://www.ip2nation.com/) and then write a php script that is included on every page you want the redirection.