If you have Irish ancestors then the new database on Find My Past will be of interest.
Now available are over 21 million Irish birth, marriage and death records. Access is via their World subscription or pay-per-view.
The periods covered for each section of the records are:
The dates sightly vary depending on whether they involved Catholic or non-Catholic. Government (civil) registration of marriages began for non-Catholic marriages in 1845, for Catholic marriages in 1864, and for births and deaths in 1864.
From 1864 to 1921, the birth, marriage and death records cover all 32 counties in Ireland. From 1921 to 1958 they cover the Republic of Ireland, excluding Northern Ireland.