1: To access blocked website, type the IP number instead of the URL in the browser address bar. However, if your blocking software maps the IP address to the web server (reverse DNS lookup), the website will still remain blocked.
2: Use a URL redirection service like tinyurl.com or snipurl.com. These domain forwarding services sometimes work as the address in the the url box remain the redirect url and do not change to the banned site.
Access Google Talk Chat or GMail in Office
3: Use Google Mobile Search - Google display the normal HTML pages as if you are viewing them on a mobile phone. During the translation, Google removes the javascript content and CSS scripts and breaks a longer page into several smaller pages. Google Mobile
Use Mobile browsers as proxy to open restricted websites
4: Enter the URL in Google or Yahoo search and then visit the cached copy of the page. To retrieve the page more quickly from Google's cache, click "Cached Text Only" while the browser is loading the page from cache.
5: There are anonymizer websites who will fetch the blocked web page from their servers and display them to you. As far as the service provider is concerned, you are viewing the page on the Anonymizer website and not the blocked site.
6: You can access blocked or restricted websites by using Yahoo Babelfish or Google Translate language tools as a proxy server.
You just have to invoke the Google translate service with the same language pair like English to English. Assuming that Google is accessible in your school, you should be able to access any website with this method - Babelfish Proxy Sever
Unblock restricted websites that require login
7: Anonymous Surfing - Browse the internet via free proxy server. A proxy server (or proxies) is a normal computer that hides the identity of computers on its network from the Internet.
Which means that only the address of the proxy server is visible to the world and not of those computers that are using it to browse the Internet. Just visit any proxy server with your Web browser and enter a URL or the address of the blocked website.