An article written over at slashgear.com by Don Reisinger describes the reasons why he thinks that the future is to have the Google TV service in your HDTV, rather than a separate Set-Top box.
Many people want to be able to access all their content from one device; this would preferably be the TV with the integrated software. If you don’t have to upgrade and wanted Google TV, then buying the extra box might have to be your option, which could cost you around $300.
I just hope that other manufacturers follow Sony’s footsteps by equipping their future HDTVs with Google TV. Personally, I would rather have everything in one unit. Would you prefer Google TV in a set-top box or HDTV?