These are but a few of many Irish Web sites.

A Guide to the General Registry Office
Ancestry
Ancestry Canada
Ancestry UK

Church of Ireland
Clogher Historical Society 
Digitized Collection of Early Irish Maps

Emerald Ancestors
Enneclan

From Ireland Genealogy & Family History

General Registry Office of Northern Ireland
Grand Orange Lodge of Ireland
Griffith’s Valuation

Ireland Genealogical Research Society
Ireland Genealogy Project
Ireland GenWeb
Ireland Newspaper Abstracts
Irish Family History Foundation
Irish Genealogical Society 
Irish Genealogy
Irish History Links
Irish Merchant Seamen
Irish Times (John Grenham's Site)
Irish Townland Maps
Irish World Online

North of Ireland Family History 
Northern Ireland GenWeb

Library Ireland
Linen Hall Library

National Archives
National Library

Ordnance Surveys of Ireland
Origins Network

Presbyterian Church in Ireland
Public Register Office of Northern Ireland

Registry of Deeds Index Project
Royal Irish Constabulary

Ulster 1641 Depositions Project
Ulster Ancestry
Ulster Clans
Ulster Folk and Transport Museum
Ulster Historical Foundation 

Renowned Irish Genealogist, John Grenham, was in Ottawa and Toronto in August 2009 and gave the attendees the following list of links.  Note that some may be duplicates of the above! Click here.