In reply to AndyC:
> Do you need a Google account to use Chromecast? Is Google harvesting your viewing habits? Just wondering.
No, you don't need a Google account, as mentioned it pretty much works out of the box.
If you're bothered about your viewing habits being harvested:
a) don't be - do you really care?
b) as time goes on your options will only decrease - stick with a tv aerial and broadcast tv until it all eventually gets switched off if you're paranoid.
c) Google (and others) only really cares about you as part of an aggregate - eg you will fall into the segment for 41-50 year old middle managers from the east Midlands with a penchant for goat porn so will get relevant content, rather than being interested in your specific, personally identifiable details.