Info Please Comprehensive and informative.
Ask Me Help Desk Subscription needed. Can get paid for providing answers.
Ask Jeeves for Children Provides pictures that might be useful for school work.
Acronym search I find this one very useful! But there are so many, it is rather intimidating
The Internet Archive Wayback
The Open Directory Project maintained by a vast, global community of volunteer editors. Difficult to find one's way around.
Literary Encyclopaedia This has very many articles but only the first 600 words of each can be read unless you take out a subscription. Very useful for students, perhaps.
A9 New - Read 7 reasons to use A9 on their pageNote to read books have to sign in at Amazon. Needs script permission.