I'd have no problem putting Homebrewing as an interest on my CV (although hopefully I won't have to do that for a long while, and if I do it'll be by choice <!-- s:? --><img src="{SMILIES_PATH}/icon_confused.gif" alt="

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I would have reservations about putting down "An interest in Beer", not because there's anything wrong with it, but more because people could misinterpret it.
But the whole point of putting down interests/hobbies on your CV is to show that you actually do more than sit around in your pants all day watching tv. It also gives the interviewer a chance to get to know you a little less formally. So I suppose if you could articulate your interest well enough to dispel any perceived misconceptions you'd be good to go.