Specifically, while technically a Hugo Award for one of the periodical categories is for the periodical work (Locus, Emerald City, Ansible, or in the case of Kathryn Cramer, The New York Review of Science Fiction) common usage (and common sense) refers to the editor or editors of that work as having been nominated or winning the Hugo Award. So, for instance, while the 2004 Hugo Award for Best Fanzine went to Emerald City, it's perfectly accurate and in keeping with accepted usage within the field to say that Cheryl Morgan won a Hugo Award.
Go read the discussion page on that article for this wiki-editor's somewhat askew opinion of how our awards work. I take it that by his definition, only the five "people" categories (Fan Writer, the two Artists, and the two Editors) are actually won by people. All of the rest are by works and the people responsible for those works aren't allowed to claim credit for them.
Edit, 23:10: Fixed the number and reference to "people" categories after johnnyeponymous pointed out my mistake.