This seems to be a common request for people who want to keep their anomnimoity on the internet. One of the more popular sites for this is
Code:
http://www.anonymizer.com
As for ip spoofing, this is the act of forging packets with fake source address information to hide where the packets come from. There are plenty of resources on the internet about this, google is your friend. Also you can google for sites like anonymizer, I'm sure there are plenty more.