Use the following web sites at your own risk.

Search engines
Google search engine is also good source of information
http://www.google.com

"The Open Directory Project is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors."
http://dmoz.org/

Others
http://www.lycos.co.uk/
http://www.hotbot.lycos.co.uk/
http://www.yahoo.com/
http://www.altavista.com/

Best ever!!! (me thinks) is webferret
Not a search engine but a program which utilizes a whole heap of different engines you can either buy it or put up with the advertising
www.ferretsoft.com

I recently found the Google Toolbar which adds a built in search engine toolbar to IE....Very useful

http://toolbar.google.com/

Search Engine World
Everything you need to know about all Search Engines

http://www.searchengineworld.com

A very useful tool for searching the internet is Copernic 2001 basic. And its free *  (but some features are disabled). You can search through multiple search engines at the same time. It also makes use of categories, which you may find useful. Download it at http://www.copernic.com

* correct at time of posting