There are several very useful reference sites on the www which, like libraries, have organized links to factual websites.  Some are lists and others are directories. These are useful to novice and experienced searcher alike.

• Price's Lists of Lists: Special Issues.com
• Internet Public Library - home page
• Internet Public Library - general/reference resources
• Librarians' Index to the Internet
• Librarians' Resource Center
• LibrarySpot - directory of sites
• refdesk.com - facts and reference