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Dictionaries and Thesaurus

Webster Dictionary 
Hypertext Thesaurus Interface 
German-English Dictionaries 
Dictionary of Computing 
American English Dictionary 
Acronym Dictionary 
Technical English 
Computer Jargon 
English-German Dictionary 
German-English Dictionary 
English-Chinese Dictionary 

Many Other On-Line Dictionaries 

Encyclopaedia

Britannica Online 

Writer's Guide

Fowler, H. W. 1908. The King's English. 
Strunk, William. The Elements of Style. 

Directories

USPS ZIP Code and Address Information 
800 numbers