With LinkedIn being the most powerful social network built for professionals and the iPhone quickly becoming a high-demand for business professionals, it was inevitable for the development team at LinkedIn to tap into such an already-highly-targeted market. Although the iPhone app is not amongst the most downloaded apps in the AppStore, it shouldn’t matter that much for a professional that’s looking to increase network visibility, is always on the run and wants to stay in touch with updates in his or her own network.

LinkedIn for the iPhone allows you to set and edit your status for others to see, add a new contact, view your connections’ profiles and gives you access to your LinkedIn news feeds. One of the most useful features of the app is its on-the-go access to important contact information from your connections. If you’re about to head on to an interview, with LinkedIn for the iPhone you can learn more about the person your about to meet and the company itself.

One of the all time favorites messengers, Yahoo Messengers made it quickly to the top of most downloaded iPhone and iPod Touch apps in the Appstore. All the smileys and emoticons, chatting for hours with your friends, IM and SMS messages, update your status, add new contacts and share photos with our friends, Yahoo Messenger for the iPhone has all the features you enjoy on the web-based application on your desktop.

With YM for iPhone, you have all the features of the popular Yahoo Messenger, including the option to send an SMS straight from the iPhone, using your Yahoo Address book. You can set your status as invisible, busy or customize it just as you normally would. The archive feature is also supported as you can see past conversations even after logging out of the app. Sorting your contact list or showing and hiding your offlines are also an inherent feature of the iPhone app.

Zynga launches LivePoker quickly getting to the top of most downloaded apps from the Apple Appstore, and infecting even those that made it a point not to get addicted to casino games. With LivePoker, Zynga brought the excitement, the strategy, the stress and the joy of winning that big pot that only Texas Hold’Em can provide.

Being the first ever app to be launched in the App Store that makes use of Facebook’s Connect Platform and lets users sign in to LivePoker using their Facebook account. For non-facebook users, the game lets you use your Hi5, Bebo, or MySpace account to play. Simply sign in to your account, invite friends from your list to play, or choose a table and join others as you call and raise the stakes.

LivePoker can offer even the most experienced players hours of fun gameplay, coupled with realistic features like a drink bar that lets you offer cocktails to friends and opponents. Choose an avatar, or use the one from your Facebook account, chat with friends across the table, and generally enjoy your experience like you would at the best tables in Vegas.

Skype now has a competitor for the mobile market with Truphone releasing their own iphone app, allowing users to save big on international calls. With its new version hitting the Appstore, it definitely called for a review, especially with its enticing offer for better call quality, a unifying IM and several interface improvements.

Like Skype, it gives you free voice calls worldwide to other Truphone users, instant messaging, and great rates for calls made to landlines and other mobile phones. Like Skype however, calls are only allowed over WiFi, as iphone VoIP apps aren’t allowed to use 3G. So, if you and your partner are both in range of a hotspot, jab all you want, it’s all completely free. Even calls to landlines and other mobile phones come at pretty low rates. Calls to the US come at 51 cents a minute, less if you sign up for one of their monthly plans.

When the Appstore hit the 1 billionth milestone, one of the big winners was the three-man-development shop behind Bump Technologies with their easy contact inter-exachanger Bump. The free app makes it easy for iPhone and iPod Touch users running it on their device to exchange contact information by bumping the devices between them.

The idea behind the application is simple enough. Two users run Bump at the same time, “bump” their device to one another and the application offers the possibility to exchange contact information. That’s it. No typing, no writing, no exchanging of business cards or little paper napkins.

The app needs a stable internet connection, be it WIFI or 3G for the iphone to connect and upload and download contact information. When we started the application, it connected to the server and asked us to select the contact information to be available for exchange. After connecting two iPhones to the Bump server, a mere waving of the two devices did the trick. The sharing screen pops up and the exchange is made with a flick of the finger, the whole process taking no longer than a couple of seconds.