I guess you do not fully understand how the AppleTV works. Do you even own and use one? I have had mine since the month it was released and have since updated it to version 2.0. It is a joy to use and we use it everyday. There are high def video podcasts from National Geographic, NASA, etc. You can rent HD movies (you cannot do this from your computer). You can view MobileMe and Flickr galleries of your friends. You can view YouTube videos. You can use AirTunes to stream music to AppleTV. Now you can even use your iPhone or iPod Touch as a remote control to control AppleTV. It is a great little device that works in a way that is pretty new. It is not a replacement for your cable TV. It is a new way to consume media. With just a remote you can operate it in a way you cannot do with a normal computer. Also, since it has digital outs and HDMI, you can integrate it in your home entertainment environment.
Is Apple TV the Stupidest Apple Product Ever?