With the release of iOS 4 there are a lot of updates to apps being released, enabling them to take advantage of the new features.
For a complete list of all the apps that have been tested and proved working on iOS 4 you can run the following Google search.
A small sample of some of the apps that have been upgraded to use new functionality are:
- How to Cook Everything
- Internet Radio Box
- National Rail
- TuneIn Radio
iOS 4 – List of all the apps!