In the same way that we had a browser war, there is a similar activity going on with TV set-top boxes. These are generally a slightly lower than normal functionality browser burned into a ROM or upgradeable Flash PROM chip.
There are several varieties already available in various forms. From the MSIE tradition comes the WebTV box. This is a browser originally based on MSIE 3 but now enhanced somewhat. There are limitations due to the need for it to occupy as little memory as possible. For those who prefer the Netscape browser, the Liberate box comes from a company initially formed as a joint venture between Netscape Communications and Oracle. It now has significant backing from Cisco and all things considered may well become the dominant platform.
Other alternatives exist from Bush Electronics and Netgem.
A good source of information about the progress and development of the whole area of Digital Interactive TV and set-top boxes can be found at the Ruel web site.