The latest post on John Grenham’s Irish Roots blog is the All-singing, all-dancing barony maps.
It links to interactive maps. Pick a county, see the barony boundaries, zoom in to see the civil parishes in each barony, zoom in further to see townlands. No clicking through barony names to the wonders of related Irish records.
The post explains the history of the baronies, which were largely irrelevant by 1860.