I cannot recall Google for having done this before but earlier this month, Google invited the public (that’s you and me) to take their next generation of web search for a test drive. For some reason, it has been code named Caffeine.
Google’s engineer, Matt Cutts has invited us all to test it at http://www2.sandbox.google.com. You can test the old Google against the new for yourselves at http://www.comparecaffeine.com. The new architecture is said to include size, indexing, speed, accuracy and ranking changes and Google is asking searchers to give it a try it and report their feedback.