I'd focus more on making your paysites "m.friendly.com" than investing in developing mobile based apps. I could see this being a hot idea for a VOD based site like hotmovies or something.
I agree with making your site m. friendly, but I see people are only making them iphone.friendly and calling it m. friendly HUGE difference and leaving oney on the table.
Apps development is neither difficult nor costly, the submission process is a pain in the ass though.
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