Rumors suggest that the new Xbox live update will have a Browse option. The photo at the bottom shows a Browse option which is not necessarily a browser. Could this really be the  long waited browser or is just part of some browse function . I personally think it’s probably some feature which allows you to browse all the media in the market place. So you can just see all the video games and so on all from the same place. This could very well just be a browse function that computers have to see the list of all the files on your 360. Even my mp3 player has a BROWSE tab.  

There is the so called evidence but it is presented in the market place section. How do I know because I see a Add-on arcade Xbox Originals tab. So it could probably just be a way to browse all the games like demos, arcade, add-ons and so on, all from the same place. No need to jump to conclusions since if it were a browser it would probably be in one of the Media sections not the market place.