There are two basic types of tools he may have used to identify you as a visitor. He could have had a Web-based tool like Google Analytics or tools he installed on his website, like the open source AWStats or the commercial WebTrends. He could have also manually looked up your organization's IP space and searched for it in his logs.
There are a couple different ways for your employees to surf the Web anonymously, depending on the technical sophistication of your end users and your specific needs. You can either implement a Web proxy for anonymous Web browsing, like those at Anonymizer.com or an anonymity network like Tor. Both types of tools need to be configured on your local computers for maximum effectiveness in case you have mobile computers. If all of your computers access the Internet through your local network, you could also configure a local Web proxy on your network and then tunnel this proxy though an anonymous proxy service
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