Here's a list of where I find online city and other directories, and other useful resources.  For offline resources, check out question number 4 on the FAQs page (link below)

City Directories Chart - use this great form to record information found in city directories, both online and off; created by Dae Powell at Shoestring Genealogy.

Subscription Databases Websites: Ancestry, Footnote, GenealogyToday, New England Historic Genealogical Society, WorldVitalRecords

Free Directories Websites: All-Ancestors, DistantCousin, Eve and Don, KentuckyCityDirectory, Old Directory Search

Free Online Book Websites: BYU Digital Books, Digital Book Index, Google Books, HeritageQuest (must access with a library card from a participating library), InternetArchive, Making of America (Cornell U), Making of America (UMich)

Local Genealogy Resources: Cyndi's List, Linkpendium, USGenWeb, USGenNet, WorldGenWeb

Public Libraries: Library of Congress, Library and Archives of Canada, PublicLibraries.com, WorldCat

Museums, Universities, and Archives: Virtual Library Museums pages, WWW Virtual Library, Repositories of Primary Sources

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