Remember Google Caffeine? It's the new Google search engine that's going to replace the old one. We've tested it thoroughly, and while we've seen some signs of improvement, the change is far from dramatic.
The test version of Caffeine has been available on www2.sandbox.google.com for about a month, but now we've found a simple site, called Compare Google, that lets you compare the results between the old (current) Google engine and Caffeine. There are no options to speak of, just a search box and two sets of results, but you don't really need much more for a quick test.
As far as the results go, the changes still seem rather subtle, but one has to admit that Google Search is functioning quite well as it is, so it's hard to expect dramatic improvements in this area.