Ethernet shield + arduino as a CLIENT, please help!

Using Arduino Networking, Protocols, and Devices
15

I see it now. That is a virtual hosting server, so you will need to send the Host parameter with the GET request. See reply #9.

edit: If you want to know how I can tell if it is a virtual server or not, here is how.

C:\Documents and Settings\user>nslookup www.valerioantonangeli.it
Server: ip68-105-28-16.at.at.cox.net
Address: 68.105.28.16

Non-authoritative answer:
Name: valerioantonangeli.it
Address: 46.4.96.70
Aliases: www.valerioantonangeli.it

Then go to your web browser and try to load http://46.4.96.70 . It will not be your web site. Instead it is normally your virtual hosting company's website.