I did a google on it few weeks ago and only managed to find 2
useable (meaning free) online proxies, one of which is poxyproxy. I
have forgotten the other one. If there are others, I did not manage
to use them. Most of them are for paid members, but there are many
that allow limited surfing to stipulated sites. Only poxyproxy
allows unrestricted surfing.
There is a slight lag when surfing through poxyproxy,
understandable since your traffic is routed through the proxy's
server and has to clock extra distance before reaching you. The lag
is noticeable but tolerable.
There are freewares that allow you to use anonymous proxies such as
the anonymiser (I know i got the spelling wrong) and proxomitron
that allows you to download anonymous proxy lists and routes your
traffic through these proxy servers. Proxomitron even allows you to
constantly rotate your proxy to ensure even more anonymity. Some
proxies are really slow, so you have to sift through all the
proxies to find the faster ones. Of course, nothing is faster than
bypassing all these proxies and surf direct.
Despite all that I've said, your ISP still knows what you download
and where you visit because ultimately, all traffic still has to
pass through your ISP, unless your information is encrypted.