I just found Directory for Proxy Sites, maybe this can be useful for Web Proxy to promote their web, I just check it but they required to Reciprocal link as Owners Verification (maybe to avoid unwanted spam submission)
Here is it : http://www.freedirectorywebsites.com/niche-directories/free-web-proxy-sites-list.php
And here the submit url : http://www.freedirectorywebsites.com/submit/submit-proxy-sites.php
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