A WebmasterWorld thread reports that Google is still offering search tips to help searchers become more efficient searchers. In short, Google offered what they call a "tip" at the top of the search results, directly above the organic results. The tip read:
Tip: hit return instead of clicking on the search button to save time.
I tried to duplicate this tip by searching over and over again and clicking on the search button, but I was unsuccessful.
Forum discussion at WebmasterWorld.