| Yahoo | Standard categories plus extensive subcategories |
| New Zealand Digital Library | Many "collections" of digital documents |
| Martindale Reference Desk | Many categories; especially good for science |
| LookSmart | Many categories; good recipe sites |
| School Surf | Good for info for school projects |
| On-Lion | NY Public Library Kids Services |
| Health | Categorized by disease |
| Library of Congress | Historical documents & photos, congress (under Thomas) |
| Pueblo | Consumer Information |
| Standard categories plus search | |
| Altavista | Standard categories plus search |
Examples
Quiz