believe me, an iPhone/iPad/iOS app is definitely something we've also thought about, even way before the forum came around.
first, it would require our own pin database to interface with (which, we even started working on, but it's a huge undertaking and we dont have the time nor resources right now, unfortunately -- but it IS on our list!), so basically us creating another pinpics would be the foundation and then either having a mobile version available using iphone markup [sort of similar to the iphone webapps] and/or making a standalone iPhone app.
there are a lot of resources required to do this, and we think you guys would be much better served through the forum right now. once we've established ourselves, then you can definitely count on us pursuing this
Much of the reason behind the creation of this site and its features stems from our experience with other pin sites, and what we'd like to see in them. We didn't want to be the next best thing, we want to be the next BETTER thing -- Which is why we are constantly adding and innovating as well as taking your concerns, suggestions and comments [positive or negative] into consideration.
We love to hear what you have to say, so please don't feel like you have to hold anything back.
happy posting!