superclown2 - 9:21 am on Sep 20, 2011 (gmt 0)
One or two of the searches I've done this morning here in the UK have no white space. These are the minority. Looks to me as though Google is still experimenting with this.
Incidentally I did a search today, saw nothing I fancied and hit 'enter' by accident, and the first ad on the page loaded. I don't think I'd be too pleased if I was paying for that ad, and it could be triggered so easily by someone with no interest in it. Forgive me if this is an old story but I've only just noticed it.