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To disagree, not placing spaces around an emdash (—) is the more common choice in the style guides I've looked at. Basically, unless you are a newspaper or magazine, most academic and other style guides say no spaces around an emdash. OTOH, spaces are generally used around an endash (–).
On yet another hand, I've gotten very paranoid about any automation of converting hyphens/minus signs to anything else since it's "fun" to exclude non-text portions of a file. Epubcheck is not very happy when you have utf – 8 instead of utf-8 or when you convert cover-image to cover—image.
Then we have the dim glows who use a double hyphen for an emdash.
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