If you want to obscure your identity and IP address from a particular web site you visit, then you'll need to find some reliable working proxies. there are lots of reasons people use proxies they are surprisingly useful servers and have all sorts of cool uses.
The main difficulty with free working proxies is because generally the administrators of these servers don't even know their server is being used as proxy server. Often these boxes are just misconfigured internet facing servers which have been left open by mistake. It doesn't take long for people to find them and they start getting added to the endless lists of free anonymous proxies on the internet.
It doesn't usually take long before they are completely overwhelmed with surfers bouncing off these proxies and browsing via them becomes a painfully slow process until they either fall over or an embarrassed systems admin realises his mistake. But never fear there will always be a new batch of proxies along very soon.
Whatever your use for using a proxy server, whether you want to bypass your work or schools proxy to access restricted sites or just you believe in privacy and freedom of speech. You should be extremely careful what you use these servers for - many, many free anonymous proxies are set up for the purposes of identity theft and stealing data. When you use a proxy all your web browsing goes through that single point first and as most html traffic is in clear text then obviously identity thieves, hackers and all sorts of spyware is usually found or installed on them.
Unless you know all about who runs a particular free proxy server, then never, ever use it to pass any sort of personal or private information. Personally I would never go near a free anonymous proxy partly because I know exactly the sort of people who target these servers to steal information.
If your goal of protecting your identity and privacy on the internet then a free anonymous proxy is about the worst thing you could use. Sure it will likely block your IP address from the web server you are visiting (if it's configured correctly) but all your data is in the clear before that point and your ISP has a complete list of every server you are visiting anyway (unless you use end-to-end encryption). That's before you include the distinct possibility of Mr Identity Thief sitting on that proxy server with a sniffer capturing every single piece of data both ways!
Free anonymous proxies are extremely costly to run and less face it you never get anything for free. If you want real privacy, real anonymity and to surf at super fast speeds you are either going to have to seduce a systems admin at your local University or use a paid service.
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