If you have an error message not found when browsing to your new website,  or if your have just changed the named servers

1) Try a different browser.
2) Clear your browser cookies and cache/temp internet files, also check security settings, and clear your local DNS :

http://byet.org/cleardns.php
http://www.techiecorner.com/35/how-to-flush-dns-cache-in-linux-windows-mac/
http://www.tacktech.com/display.cfm?ttid=330

3) Restart your computer.
4) Restart/reboot your network modem/router (if you have both, restart the modem first and then the router)

If you still have no connection please try a proxy server :
http://www.proxy4free.com/list/webproxy1.html

Please allow up to 72 hours for world wide dns propagation, then let us know if you still have problems.