You might want to cover the issues raised in this article

http://www.theregister.co.uk/2008/12/15/iphone_cheapskates/

I think it makes some interesting points, particularly for developers looking to make money
Source(s):
http://www.theregister.co.uk

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Depending on the sophistication of the audience I would consider talking about privacy issues and the pros and cons of having a closed system. For example I heard great reviews about the Obama app, but no offense to them, I don't trust that they aren't collecting phone numbers to use in the future.

As for an open (G1) versus closed (Apple) system I think the benefits are more objectively analyzed.
Pro: someone reviews the app for stability and functionality.
Con: having to wait for someone to subjectively include an app based on functionality.

Pro: one easy place to buy and install apps means more secure shopping from new developers I might not trust otherwise
Con: apple takes a cut of the profits

There are plenty of other reasons, but as the future of mobile phones clearly will be based on app stores I think it is worthwhile to compare open v. closed systems.
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Pro:
-Everything is in one place
-Easy User experience
-Recommendations
-Ease of use in installing and updating apps
-Apple is able to control user experience by controlling what Apps are available

Con:
-Have to travel through Apple
-Can only get apps from the app store
-Not all features of the iPhone are available to use by developers in the app store
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