The free website Irish Genealogy has been adding the digital images to their indexes of some Dublin, Kerry, Cork and Carlow parishes. Records for Roman Catholic and Church of Ireland baptisms, deaths and marriages have been digitised (along with a small number of Presbyterian records from Lucan) . If you have Dublin ancestors, it is well worth visiting this site as you may find several generations of your forebears documented within these registers. Be aware also that not all of the records have been made available and the project is not yet complete.
This wonderful project has been supported by the Irish Department of Tourism, Culture and Sport – so if you are inspired to go off and visit the land of your ancestors, let the Irish Minister for Tourism know that your family history research influenced your decision to make the trip.