About
http://www.about.com/
A collection of how-to guides and informational articles, written or sourced by experts.

Answers.com
http://www.answers.com/
Answers.com pulls information from several different reference sites to provide answers to user questions.

Ask
http://www.ask.com/
Lets users search the Web for links, images, videos, driving directions, and news, along with local city listings and shopping links for products.

Blogrunner
http://www.blogrunner.com/
Aggregates news from blogs and organizes it by what's buzzing.

Citizendium
http://en.citizendium.org/
A Wiki-style encyclopedia with entries that are fact-checked and written by community members who use their real names.

Delver
http://www.delver.com/
A social search engine that creates a graph of how you're connected to friends, family, and other people on the Web.

eHow
http://www.ehow.com/
Tells you how to do just about everything with how-to guides written by experts.

Fluther
http://www.Fluther.com/
Lets users ask questions and get them answered by an online community. Features asking via IM and viewing responses coming in in real time.

Evri
http://www.evri.com
A semantic search engine that attempts to show how things are connected by linking together multiple results.

Freebase
http://www.freebase.com/
A human powered database that can power developer-created applications.

Google
http://www.google.com
The most popular search engine on the Internet, lets users search the Web, blogs, images, and more.

Hakia
http://www.hakia.com/
A semantic search engine, a technology that lets users search the Web using everyday word combinations.

Howcast
http://www.howcast.com/
User-created how-to videos that are built with professionaly-created templates and play on a video player that breaks up each step into a segment.

Inquisitor
http://www.inquisitorx.com
A search helper tool. It works on multiple platforms from desktop browsers to the iPhone.

Instructables
http://www.instructables.com
Lets you purchase advertising based on keywords or phrases you choose.

Live Search
http://www.live.com
Microsoft's free Web search tool that plugs into various Microsoft Web properties as well as general indexing for pages all over the Internet.

Mahalo
http://www.mahalo.com/
A search engine where the search results are created by humans. It's also a live news site where paid contributors post news briefs.

Scour
http://www.scour.com
Combines results from top search engines then lets users vote on and reorder them to be more relevant. .

SearchMe
http://www.searchme.com
A search engine that presents the results in large thumbnails that can be navigated like album covers.

Techmeme
http://techmeme.com/
Tracks the latest tech news from all around the Web and updates throughout the day.

Technorati
http://www.technorati.com
Tracks stories around the Web and organizes them on a news page. It also gives each post authority based on how many other blogs are linking to it.

Twitter Search
http://search.twiiter.com
Search engine (formerly Summize) lets users search user tweets in real-time and view words or topics that are trending.

Web MD
http://www.webmd.com
An encyclopedia of medical information and advice, from prescription medicines all the way to medical procedures.

WikiHow
http://www.wikihow.com/Main-Page
Provides user-generated and maintained Wiki articles about how to do things.

Wikipedia
http://en.wikipedia.org
A free online encyclopedia. Instead of being authored by a select group of editors, Wikipedia can be edited by anyone anywhere, and at any time.

Wink
http://www.wink.com/
A free people search engine that lets you find individuals by first and last name, and by where they live.

Xoopit
http://www.xoopit.com
Scours your e-mail in-box to help you find and organize attachments.

Yahoo
http://www.yahoo.com
Yahoo's front page is an ever-changing collection of links and information, and soon the home of third-party apps and services.

Yahoo Boss
http://developer.yahoo.com/search/boss/
An online real estate agency that matches sellers up with buyers and provides a localized agent to help them sell.

Yahoo Search
http://search.yahoo.com/
The second most popular search engine in the world, it indexes Web results, images, video, and more.