1) The majority of people don't really know what's missing, but the Zune still doesn't quite "feel" right to them...though this may be largely just a perception issue. As in, they're not giving the Zune a chance.
2) The Xbox integration factor is important - people want to be able to download a movie on their Xbox and move it over to their Zune. It's completely insane that Microsoft can't connect the dots and fulfil their destiny...they have all the pieces!
3) A Mac client is important for a significant number of people, though the cynic in me wonders how many of those people who voted for the Mac client are just Mac users voting for anything Mac and not really people who are interested in the Zune.
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