IPL - The Internet Public Library.

Wikipedia

RefDesk

iTools - Your one-stop reference desk.

Library Spot

Librarians' Internet Index

Infoplease

Mapquest

Google Maps

Hotsheet - The easy way to the best of the web!

BJ Pinchbeck’s Homework Helper

Virtual Gumshoe - Investigative Resources Available on the Web.

CLEVNET Databases

Ohio Web Library 

Learning Express Library - Provides online, interactive practice tests.