Web apps is a well known part of the iPhone's system and paves the way for the ability to run applications within the MobileSafari browser. Up until recently, we all thought this meant web-oriented apps required Safari to run. However, with the release of iPhone 2.1, a sneaky new feature rolled out that allows for fullscreen web-app use without launching Safari at all.

 
Let me make a word of note, however. It is only web-apps that have been coded to go fullscreen that will work without Safari. The idea is to make the web apps feel more like native iPhone applications.

If you want to see your apps in fullscreen, try out the following step-by-step guide from IntoMobile:

• Fire up your iPhone’s Safari browser
• Navigate to “http://webapp.net.free.fr/Demo/Index.html”
• Save the webpage/web-app to your homescreen
• Hit the “+” button along the bottom navigation bar
• Select “Save to Homescreen”
• Go back to your homescreen and fire up the newly saved web-app
• Enjoy using the web-app in full-screen mode with 100% less Safari - Notice the absence of any browser navigation controls (URL field, bookmark button,etc.)

[via IntoMobile]