keyplyr - 12:54 am on Jan 7, 2012 (gmt 0)
GWP did an actual (small) crawl last week. Took 50+ HTML pages, no images/scripts/css/etc.
Sorry, don't remember if it used that referrer and I stopped saving old logs so I can't look.
Also, I *think* G stopped using the magnifying icon for the previews when they moved that icon up to the search box. Seeing that, I did it on my site too :)