as far as I tried, no proxies are working at all, among the one you find on google, or on sites dedicated to this!
Using open proxys without permission may be a violation of your local computer crime laws.
Open proxys have an average lifetime of a few hours. The people who's connection is being used will notice their conection going very slowly or the ISP will shut it down due to the flood of spam.
"I went over to a friend's house the other day. He was having problems with his computer and he asked me to look at it, and I realized he had Windows Me and it's like, oh no—that's your first problem."-Michael Dell, founder and CEO of Dell.