Some of the major search engines release beta versions of their products with different interfaces, features or focus for people to test & give them feedback on. Take a look at what may or may not be coming up in the next few months.

Omgili
A specialized search engine that focuses on "many to many" user generated content platforms, such as, forums, discussion groups, mailing lists, answer boards and other sources of. "subjective information". As opposed to traditional search engines, which search for sites and pages, Omgili finds consumer opinions, debates, discussions, personal experiences, answers and solutions in real time.

Collecta
New search engine with real time results from Twitter, YouTube, Flickr, blogs, news sites & social media.

Hunch
Hunch is a decision-making system that uses decision trees to make decisions based on users' interest. The system asks users a series of questions about a topic to help weigh the options. Upon completion of the questions, the user is presented with results, where he or she can agree or disagree with the results to help "train" the system. Previous searches by other people can be browsed by category.

Google Code Search
Search public programming code, similar to Koders but with an advanced search mode option.

Google Experiemental
Several experimental interface features, including "Timeline & map views, which displays results on a timeline or map, and two interfaces which allow you to search deeper in a particular type of content or to search related items.

Google Squared
Seeks to answer factual questions, presenting the results in a spreadsheet format which can be editd.

Sandbox from Yahoo! Research
Gives you a sneak peek at Yahoo! projects in the works with a virtual playground for you to take their innovations for a test drive. .