If you use a computer at work, school, or in a public place that blocks access to certain sites, the easiest way around the problem is to use a proxy site. The problem is that the filters these places use are constantly adding new proxy sites to the list of banned sites so proxies have a limited lifetime.

There are sites that list other proxy sites, but those too eventually get banned. The best way around this is StupidCensorship.com (http://www.stupidcensorship.com/cgi-bin/nph-surf.cgi). You can use their site to sign up for an email digest of the latest proxy sites. That way, you can always have a list of new proxies, and you don't need to go out to the web (to a site that may be blocked) to get the list.