Hmmm... I tried checking out www.zill.net, and I got the following:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.
Reason: Could not connect to remote machine: Connection refused
Apache/1.3.12 Server at www.zill.net Port 80
This is kind of ironic, in light of the pitch for Apache, mod_aolserver, etc. ...
The "proxy server" message, by the way, is not on the end I was connecting from, since that end is a direct connection to the internet.