A warning about search engines: they often change daily. If you get stuck, please read the help information on how to search. Different search engines will produce different results; no search engine can cover the entire Internet.
 

Altavista
Good for searching for very specific things. Will usually find "the needle in the haystack."

Ask Jeeves for Kids
You can actually ask real questions to help find sites.

Google
Very easy to use, and usually provides what you need at the top of the hit list.

Hotbot
Good for searching for images and people.

Internet Public Library Youth Division
Another great directory designed by librarians.
KidsClick!
Another directory of categories, with sites selected especially for kids.

Kids' Tools for Searching the Internet
A collection of search engines and directories that are easy for kids to use.

700+ Great Sites from American Library Association
Sites specifically chosen and organized by librarians.

Yahoo!
Terrific for browsing and searching by category.

Yahooligans!
Similar to Yahoo!, but specifically designed for kids.