The National Archives of Ireland has made a substantial addition to their genealogical collection with the release of a new database called Calendars of Wills and Administrations 1858-1920. Basically, the database contains an index of wills and associated letters of administration in Ireland.
The database can be searched by county, the name of the deceased person, the names of executors and the names of beneficiaries. The index varies somewhat depending on the year of the record. A typical entry lists the name, address and occupation of the deceased, along with the date of death, the date and place of probate, the names and addresses of the executors, beneficiaries of the will (and their relationship to the deceased) and the financial size of the estate. Access is free.