AdFree for Android removes most ads in the browser and other apps. It does this by nullifying requests to known host names in the system hosts file.
If you have problems with this app, or you know of additional host names not being filtered, please comment in xda-developers.com forum so it can be fixed!
0.9.16 Fixed self-update mechanism, as well as the manual update method so it does it itself, and not via a browser.
Requirements: 4.0+ | ROOT