there is a new patchstick available that gets boxee back on your atv.... that gives you pretty much what you are looking for. maybe not a browser, but at least other web based video services like hulu.
apple is being so lame with this device. to them it is ONLY a platform to sell itunes content. if you want anything else... beat it! sad to see them take a page out of the MS playbook.
no worries though, xbmc / boxee is going to be the future for sure. that is exactly what is needed to kick everyone in the ass and get the things we all want on these devices. netflix needs to create an embedded browser/app too. tivo has gone that route. maybe if we are lucky boxee will add those products/features into their platform and we are seriously stoked- all my media/content, video on demand, and my dvr! that would be sweet.