Ancestry is going to be launching a new USA collection of interest to researchers looking for Irish family members that emigrated.
Promised for June, the new collection includes state-wide indexes to birth, marriage and death records from Massachusetts, New Hampshire, and Vermont. Within this, the records for Massachusetts is likely to be of most interest to those with Irish heritage, since Boston was the destination for so many Irish emigrants.
Ancestry says this set of records includes 'more details than most'. Quite what that means, remains to be seen.
There's more about Irish emigration to America on my website.