Android is now the #1 Mobile platform in the world and its highly unlikely that an Android user doesn't have any Free App installed on their mobile. And all those who use a Free App might be well aware of the fact that ads eat a lot of space on your screen. But those users who have Rooted their Android mobile can easily get rid of these ads by using this simple App "AdFree"

"AdFree" is developed by one of the developers at xda-developers. 

AdFree removes most ads in Free Apps as well as your browser. It does this by nullifying requests to known host names in the system hosts file.