Logo designer David Airey took a monthlong trip to India starting in late November. About three weeks in, hackers took over his Web domain, davidairey.com. How'd it happen? Airey blames a Gmail security flaw he read about. Something to do with going to a malicious website that inserts forwarding filters into a user's Gmail settings. Totally messed up his life, he says, not to mention his rank in Google search results. Google says it's fixed this particular flaw, but here's how to make sure you haven't been affected.