It is indeed a web proxy service with country selection - something that is not addressed by other web proxies AFAIK.
Also, web proxies aren't as trivial as you are implying.
Oh, I didn't mean to imply that web proxies are trivial, simply that this is nothing new - there are hundreds of proxy sites from all over the world on http://proxy.org/cgi_proxies.shtml. Still, if you made this, good job!