Robert_Charlton - 6:20 pm on Sep 5, 2012 (gmt 0)
Robert Charlton - the second screen shot mentions below the third result:
"You recently searched for [the keyword in the first screenshot]"
with the first keyword bolded in the snippet title.
that looks personalized.
phranque - Thanques. Now that you've got me looking closer, I see also on the first screenshot a line beneath the last result that says "You recently searched for manufacturing".
So, here, at least, they're returning increasingly refined sets or subsets of what prior searches suggest.
I've seen Google serps drag around evidence of fairly long search histories in the urls... this even with my search history disabled... so this might be a natural test of ways to treat that history via the display.