When submitting your awesome app to the iOS App Store you need to provide screenshots for all the iPhone/iPod/iPad screen sizes. In itunes connect they're labeled by the inch size of the screen, but this doesn't help you know which simulator to fire up. So, here's a handy table of all the portrait screen sizes:

3.5 inch (4s) 640×960

4 inch (5, 5s) 640×1136

4.7 inch (6) 750×1334

5.5 inch (6+) 1242×2208

It's also worth knowing that although you can update your app description after submitting the app, you can only update your screenshots with a full new app version. So make sure you get them …

They say the future is mobile. (Ed. Two years on since originally writing this post, it almost seems like the future is here. We might have all missed the App Store gold rush, but app development for mobile is still exciting and now there's Android, Windows Phone 7 and iPads to think about.)

So, I'm quite excited to learn about developing for this new platform and see what I can create. Will I be able to use my existing web development and programming skills, or will I need to learn a new set of skills. This is what I've learnt so far about what I'll need to know.

There are two options when …