TankProxy.com - Anon Proxy!

No they don't
Yes they do. Certain protocols will still leak information. Like the DNS protocol. However, TOR doesnt even leak DNS requests if configured properly.;)

BTW, I went to http://www.samair.ru/ and did a proxy test on www.tankproxy.com and it still leaks the OS and the web browser I was currently using.
HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; .NET CLR 2.0.50727)
If you are going to be using *web based proxies* then I would recommend disabling cookies in your web browser "first" before configuring the proxy server to work with your web browser.
 
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