Using Search Australia which only returns results for domain ending in .au, the number of results returned are:
According to the Macquarie dictionary ezine is the preferred spelling with e-zine a secondary spelling. According to the Oxford dictionary the spelling is e-zine. The Oxford does not suggest a secondary spelling.
It does appear where there is no confusion when including or not including the hyphenation, there would be a preference towards ezine. For example in Australia the preference is email and not e-mail.
In this case, given ezine is used nearly 10 per cent more in Australia, and the Macquarie and the Oxford differ, I'd have to go with the Macquarie. As a result ezine will be added to the preferred Australian English spelling dictionary.
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