National Archives of Ireland has a new genealogy website, worth bookmarking, at http://www.genealogy.nationalarchives.ie/
At present you can access the Census Records for 1901 and 1911, the Tithe Applotment Books from 1823 to 1837, and the Soldiers’ Wills from 1914 to 1917.
More is planned to be added over the coming years, including
Calendars of Wills and Administrations, 1858 – 1922;All of these records will be free to access, through searchable databases and linked images of relevant pages.
Nineteenth century census survivals, 1821-51;
Valuation Office House and Field Books, 1848 – 60;
Census Search Forms for the 1841 and 1851 censuses.