The remote app is great, especially for iPad. Although I don't plan on jail breaking my Apple TV I know there are some developers working on Internet browsers for it. I know even a beta release is out.
I think ATV Flash Black will be able to let you surf the internet. It is still in beta now, but they say it will be finished soon. It costs ~$20 to pre-order and $30 when it is released.
ya using the iphone as a keyboard is nice. plus i think bluetooth keyboard support may come sometime. But you need to jailbreak and then use atv flash. (atv flash only works on mac right now and a untethered jailbreak is only for ios 4.1)