FamilySearch - Ireland

The Historical Record Collections for Ireland include:
Ireland Births and Baptisms, 1620-1881
Ireland Calendar of Wills and Administrations, 1858-1920 *
Ireland Census Search Forms, 1841 and 1851. (Searched to establish a person's age when they applied for the old age pension from 1908) *
Ireland Census, 1821  (surviving fragments) *
Ireland Census, 1831  (surviving fragments) *
Ireland Census, 1841  (surviving fragments) *
Ireland Census, 1851  (surviving fragments) *
Ireland Civil Registration Indexes, 1845-1958. Includes  birth, death & marriages 1864-1958, Marriage index 1845-1864 (non-Catholic)  
Ireland Deaths, 1864-1870
Ireland Landed Estate Court Files, 1850-1885 (Images available in conjunction with findmypast.ie $)
Ireland Marriages, 1619-1898 
Ireland Prison Registers, 1790-1924  (Images available in conjunction with findmypast.ie $)
Ireland Tithe Applotment Books, 1814-1855 *
Ireland, Petty Sessions Court Registers, 1828-1912  (Images available in conjunction with findmypast.ie $)
* Images of the original document available for free.