Proxy servers provide faster Internet access for large organizations by caching frequently searched items. This frees up valuable Internet bandwidth for other tasks. Proxy servers can also be used to block objectionable web sites and filter content,both text and images. However many people are using proxies to get around company filters. Most large organizations use proxies for both bandwidth optimization and filtering or monitoring. If you are looking for a proxy server there are many free proxy server liston the Internet that list hundreds of different proxy servers.
The term tunneling is used with proxy servers because proxies have the ability to tunnel through firewalls and provide otherwise blocked material to users. This has been very effective in getting around both government and other organizations filters. The best proxies have large amounts of bandwidth but usually charge a fee. There are however many small private proxy servers that have limited bandwidth and are setup to monitor traffic and steal personal information,passwords,and credit card account numbers.
The dangers of using free proxies are very real and many hackers are using them. All traffic can be viewed,copied,stored,and searched by keywords,such as,password,user id,account number,etc.
DANGER!!! Use caution while using a proxy servers. Never make purchases or access any accounts. Otherwise you could become a next identity theft causality.
Ultra Surf is a free proxy server that was setup primarily for the Chinese to tunnel through the governments filters and does provide adequate bandwidth. My free proxy server list would include Ultra Surf in the top ten. Another good one would be Free Proxy Server which should also be included in the top ten. There are hundreds and new ones come around almost daily.
DANGER !!! Use proxies at your own risk and maybe peril.