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.
This is not the first time Google has offered such search tips. Gary Price reported this almost three years ago in January 2006. He even posted a screen capture if you are interested in seeing it.
Forum discussion at WebmasterWorld.