You know....I don't think apple really has to worry about itunes on windoze demoting their hardware sales....I just got done with a heated discussion with my brother (die hard doze user himself) about this. But I was saying the same thing, until I actually thought about it. What this is gonna' do for apple is this:
1: Promote more money via music store.
2: Promote a larger awareness of how amazing apple products can be.
3: Boost ipod sales = even more money for development.
4. Eventually bring more switchers than turn away.
5. A corner on the online music industry
With windoze people that have never used a mac (especially all the bashers out there that have no idea what they are talking about) itunes will open up a whole new world of appreciation and enjoyment for using an app on their computer. The thing apple CAN NOT do is release the other ilife apps on windoze...obviously. This is where apple will shine.....giving doze users a "taste" of what apple can really offer them...not just a cute GUI. Chances are IMHO itunes is what can really create the large amount of switchers apple wants....instead of keeping all of our apps off limits to the normal world, we show them what they could have if they just took the plunge.