I also remember reading a while back that trying to disguise your email with the "username (at) gmail (dot) com" approach is worse than just putting the raw email out there because it's not only just as easy to sniff out on the page, but you can also search for it in search engines: try searching for "at gmail dot com" vs "@gmail.com" in various search engines

edit: source: http://varenhor.st/2010/01/email-at-domain-dot-com-is-making...