As of this writing, Google TV is only available on a limited number of devices. Aside from Netflix and Hulu capabilities, it is essentially a chrome browser for your TV.
Generic devices are starting to pop up, which are essentially an android device with HDMI ports. This basically equates to playing angry birds on your TV.
There are many televisions available with web support, and plenty at lower prices. For the around the same price, you can get a low end PC box that will let you do everything your desktop can do.