Google unleashed a new search engine codenamed Caffeine, and is asking for user feedback.
Earlier today, Google revealed a secret project entitled Caffeine, the next generation of the company's Internet search engine. According to the official Google Webmaster Central Blog, a large team has been working on the project for the last several months, pushing the envelope on size, indexing speed, accuracy, comprehensiveness, and more.
By heading here, end-users will notice that the search engine looks the same. However, staff software engineer Sitaram Iyer and principal engineer Matt Cutts says that the new infrastructure sits under the hood, and that most users won't actually notice a difference in search results.
"But web developers and power searchers might notice a few differences, so we're opening up a web developer preview to collect feedback," they added. Currently the team wants "higher-level" feedback on the differences between the current search engine, and the caffeinated version used at the new link.
To provide feedback to Google, follow these simple steps:
Do a search at http://www2.sandbox.google.com/ and look on the search results page for a link at the bottom of the page that says "Dissatisfied? Help us improve." Click on that link, type your feedback in the text box and then include the word caffeine somewhere in the text box.

As for Bing, I never even bothered. Yes, it's good to have competition, but really I don't see myself using Bing for my searches unless there's something that may only be on Bing which I doubt.
not that I'm implying that our beloved Google is not honest but just to be at ease when am talking about it.
after all, there is no use of improvements that
Yes, It was optimized for those(top 10) searches
So... it looks the same and the results are the same. How exactly is that an improvement!?
Or just like any company they want to improve on their product. Look at how many times MS has changed its search engine. Or Apple as updated its line of computers.
Dude - you made my day with this comment! Thanks for the laugh!