Following to my all time favorite list of application for iPod touch, here are the new must have applications for your iPhone 3GS. These applications include new breed of tools which is coming up fast as business grows around building applications for iPhone. Right now there are more than 65000 applications available for download on iPhone. Popularity of these application can be easily sensed with sheer number of downloads which apple has facilitated. Over last one year more than 1.5 billion applications has been downloaded from apple store.

Before you start reading i want yo caution you that these are my top 5, and yours could be entirely different.

Tweetie: Call it twitter mania, now it has creeped into iPhone as well. Out of all the free twitter application i liked it the most because of its look which appears blended with iPhone interface. Also it is the most comprehensive twitter application with almost all the features of web based twitter.

BeeJive: This is again beautifully designed Instant Messaging application which integrates almost all the popular IMs like MSN, Yahoo, Gtalk, AIM, ICQ  and others. It also includes myspace and facebook IM. It includes many features like showing online contacts, chat initiation by a tap and others. Although it a bit costly at $12.99, its worth with its host of features.

WifFiTrack: It a very useful application which can track WiFi network at a particular location. It can locate many signal which cannot be tracked by its in-built tracker. I was wondering why its not part of iPhone itself. It is adequately powered with security features and it refreshes itself after every 30 seconds.

Skype: This is the latest introduction by Skype which has been overwhelmingly accepted by users with more than one million downloads within its first week of launch.  However there are some limitation with iPhone version of skype. This only allows to skype to skype and not to landlines and mobile phones. You cannot run any background application while using skype. But overall nice welcomed introduction to iPhone.

Flight Control: It is a fun game which put you at Flight traffic controller seat where you have guide the planes to land safely. Its path can be controlled by fingers. And what more, it can played in multi-player mode.