Irish Family history and genealogy forums are a great way to connect with others who are researching the same names as you, and you can get some help breaking down some brick walls.
Find My Past Ireland
A free message board for for Irish family history
Probably the most active forum for Irish genealogy and family history.
Has a dedicated genealogy forum which is active.
Information about Ireland has an active dedicated forum.
For entries which apply to the whole of Ireland, eg general information on Ireland , one name studies covering the whole of Ireland, and enquiries when you have no idea which part of Ireland your surnames came from.