During the WWDC 2009, Apple just did not preview about the OS and gadgets, but also the applications that were going to be the best for iPhone users. Here are a few applications -

Asphalt 5 – This game app by Gameloft is claimed to be the best racing game app for iPhone ever. Comes with some amazing features like playing of music from the music library while you are driving, advanced graphics, multiplayer gaming through bluetooth,

Airstrip – An app that is helpful for medical professionals to monitor health status of the patients, and the vital data of the patient is monitored.

ScrollMotion – An app that helps in creating digital books for the iPhone and the app also incudes in-app purchase option where the books can be purchased from within the app. And the book can be downloaded when purchased, without leaving the app. The book can be saved and emailed too.

TomTom – An awesome app that helps you find directions, with every turn. Also there is a text-to-speech announcement of directions when turning your car. The app is also planning to provide special accessory that can help in mounting the iPhone properly in the car.

ngmoco brings in Star Defense gaming app – This app is for Tower defense with awesome 3D interface and multi-touch support. Also there is option for Plus Network for head-to-head playing of the game.
Its launching for $5.99 today.

Zipcar – A car sharing service with around 0.3 million members across US and UK. This app helps you find and reserve a nearby zipcar and due to the support of Google maps in iPhone 3.0 it helps you check things in Google Maps. Hitting the horn icon would make the horn of the car sound in the lot which makes searching of the car easier. And in the same way, unlocking the car is also possible.

Line6 and Planet Waves – These two are working together to control your guitar and amp from your iPhone. Adjustment of settings like guitar tuning without actually touching the guitar physically.