The collection covers 1,086 parishes throughout the island of Ireland and consist primarily of baptismal and marriage records from the 1740s to the 1880s.
I'm eagerly waiting for this set of records but expect their servers to crash for the first few days as genealogists rush to the site. In fact I went there just now and got this message when I chose various topics:
"Due to technical difficulties the main National Library website is currently unavailable."
Fingers crossed it will be up and running this afternoon. If anyone has success today, please let me know!