Interesting discovery today, a search on www.google.com.au showed some different looking serps. I noticed Google has moved the location of the URL to the upper left hand side just below the title tag of the website before the description tag.
It used to be below the description tag on the lower left hand side.
It is quite interesting how different the SERP look by simply moving the placement of the URL. Not exactly sure why they would be making this move, but it is clear that having sitelinks, becomes more important that ever.
It appears about a year ago people at Webmasterworld had seen this within adwords. http://www.webmasterworld.com/google_adwords/4142468.htm