Dr Toolittle and his assistant nurse Tulate.
I was excitied about Google TV when it first appeared, but I think its missed the boat. Most people that want to watch Youtube on their telly will have found a solution already - for me, its XBMC on a silent PC.
Anyone that wants to watch telly (and also record it) will have invested in a generic digital tv + system in its many guises, or built their own.
And if they want the two - chances are they're using Windows Media Centre or MythTV or one of the existing solutions that brings a 'desktop' to the TV screen. The reason I ruled out Apple TV (the new little black box version) is because I'm not in the iCrowd so it limited what I could use it for. Limited format support and no live TV - Meh. And the reason I'm not particularly enamoured at the prospect of YouCanvaroo is that outside of the current partners, others are not likely to get much of a look-in, other than maybe in a bit of a rubbish web browser (assuming it supports the required plugin to show whatever content you might want to watch).
Unless big G somehow makes a one-solution box that will allow pre-recorded content from every UK broadcaster (even the awkward ones like Sky), plus live telly from whichever souce you desire, plus be able to take whatever media on a physical disk to be shown - via a sensible interface, this will fail like a boss. Except if it costs about £3 to buy.