The iTunes Festival 2011 is now well under way in London, boasting 31 nights of music from 62 artists including Coldplay, Foo Fighters, Linkin Park, Bruno Mars, My Chemical Romance, and many more. If you weren’t lucky enough to bag yourself some tickets, you can still enjoy every show live and on demand with the iTunes Festival London 2011 app for your iOS device — the first of this week’s must-have iOS applications!

We’ve also included the brand new Starbucks app, which boasts Mobile Pay, reward card management and eGifts; and the Photosynth app from Microsoft, which just got an awesome update!

With the unveiling of iOS 5 at WWDC earlier this week, Apple announced a few features that may be cause for concern for some third-party application developers. One feature that wasn’t mentioned, however, may worry those who produce panoramic camera applications.

This week’s selection of must-have iOS apps features a brand new social news experience called News.me. Created by Bit.ly, with backing from The New York Times, this app shows you not just what your friends are sharing, but also what they’re reading.

Sony’s new Crackle application offers a library of over 100 great movies and TV shows, such as The Da Vinci Code, Ghostbusters, Seinfield and Spider-Man – all of which are completely free to watch.

RockMelt also makes this week’s must-haves – a web browser that seamlessly integrates social networking and syncs with RockMelt on your computer.

Find out more about the applications above, and check out the rest of week’s must-haves – including Seamless, Photosynth and FindOne – after the break!

Microsoft’s latest iOS offering hit the App Store today in the form of Photosynth; a fantastic photography application for taking 360º panoramic photos on your iPhone. It’s a free download, and one of the most impressive panorama applications I’ve tried.

The first thing I noticed about Photosynth is how easy it is to create your panorama. You simply tap the screen to start and then move your device around – up, down, left, right – and the application captures the images automatically, so there’s no need to move your device bit by bit while tapping a button to capture each tile.