iPhone App Update from a Development Point of View I am doing iPhone development and my first app is in the market. First week was pretty good but now it is loosing momentum. If I provide an update to the app will it improve the app exposure in the iPhone app store.
All an update will do is reset the star rating for the application if it an .x release (for example, 1.0 to 1.1). 

But to take the question and answer a big step further (one that falls well outside the scope of this forum), you cannot rely solely on the App Store to market your app. All of the rules for online marketing still apply.