Apple's newest mobile Operating System, the iOS 5, launches Wednesday with an exhaustive list of 200-plus new features.

Here is a look at some of the top features expected in the iOS 5.

Notification center

The biggest feature in iOS 5 is a Notification Center similar to the one found on the Android OS. The users can navigate to the Notification Center by simply running a finger down from the top of the screen, allowing them to access all their notifications from a central location. The result is that there will no longer be any more annoying popups.

iMessage

This is the new messaging service for iOS users. This option is similar to BlackBerry's Messenger service.

iCloud Integration

The iCloud service is integrated into some key aspects of the iOS 5 - photos, e-books, device backups, document storage and, of course, the iTunes music program. The most popular iCloud-powered feature amongst users could well be the PhotoStream, an option that can be toggled on or off and which allows users to automatically synchronize photos across multiple devices.

Twitter Integration

The ability to integrate your Twitter account with the iOS 5 is now a reality. Users can share pictures and tweets without having to log in to their Twitter account on multiple occasions. The iOS 5 makes it even easier to tweet from the iPhone, the iPad or the iPod touch.

PC-Free Setup

This option will allow users to activate their iDevices without plugging into a computer. In addition, all back-ups and synchronizations can happen exclusive of any connection to a computer, as long as the user has data stored in the iCloud.

Mail Update
A much-looked for update, this will allow the user to format emails. The feature will now offer options like rich formatting, indentation, moving addresses around, flagging mails and more. The feature also works in tandem with the iCloud, so the user has a free email account that syncs across all devices.

Tab Browsing

Full-tabbed browsing is now available for iPad owners, allowing them to jump between pages with just a single tap. On the iPad, tabbed browsing helps keep track of multiple web pages and switch between them with ease.

Camera App

The new and updated camera app for the iOS 5 will make taking a photo a much easier affair. Users can now capture a photo by simply tapping the Home button twice. Users can now also open the camera app directly from the Lock screen.

Camera shutter

Users can capture movement, through the camera app, simply by controlling the iPhone's volume button.

Gaming Center Enhancement

Users can now share achievements, add photos of friends, recommend friends and more. In addition, the option to add profile pictures and earn achievement points will be implemented and the users will also be able to see who their friends are following and even connect with them.

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