In what may have been the worst-kept secret in Apple announcements of late, CEO Steve Jobs announced a 3G version of the iPhone on Monday, along with a slew of new third-party applications designed for the device.

The new iPhone will use third-generation wireless technology and run updated iPhone 2.0 software. It’s expected to launch July 11, Jobs said in his keynote speech at the Worldwide Developers Conference in San Francisco. The iPhone will also be cheaper than its predecessor, with a 16GB version priced at $299 and an 8GB version that costs $199.

Hardware features include longer battery life, a flush headphone jack, silver button controls on the side of the phone, and a plastic back case that comes in black or white (for the 16GB version only).
Featured applications included a mobile-blogging app from SixApart; a new version of Super Monkey Ball from Sega; an application from eBay that allows users to monitor their bids; an application from Modality that gives medical students up-close views of human body parts to help them study anatomy; an application that gives near real-time updates on Major League Baseball games; an Associated Press app that sends out local news based on where a user is; and a service from Loopt that lets people see where their friends are at any given time. (You can see a roundup of demos of each of these apps here.)

Bharti Airtel and Apple have confirmed that they will be bringing the highly anticipated iPhone 3G to India later this year. Full review of the new iPhone is here.