Anonymous Proxy Servers
To hide IP address you can use proxy servers.
Not all of the proxy servers hide IP address. Also some of the proxy servers allows to the administrator of the internet resourse to find out your IP address.
You can check if your proxy is anonymous or not using freeware open source Proxy Checker or online services like checker.freeproxy.ru/checker/, all-nettools.com, www.leader.ru/secure/who.html.
It is better to change anonymous proxys at least once a month.
To use proxy with your Internet Explorer open Service->Browser Preferences->Connection. Then select your connection and press "Set Up" (I'm not sure about the names because my Internet Explorer has only russian menus).
To surf anonymously you also can use Anonymizer service.
Protect your identity. Did you know that detailed information about your system is automatically provided to every web site you visit? This information can be used by hackers to exploit your computer and by companies to track your activities on the Internet. Why put up with this invasion of your privacy and security? Hide revealing information from the web sites you visit, allowing you to surf the web anonymously. How does it work? Each time you visit a web site through anonimizer, they forward your request to the remote web site from their server. The web site responds to their server, and they forward the response back to you. To the web site, it appears as though the request came from them, not from you.
Lists with proxy servers