The National Archives of Ireland have put the final batch of counties up in their online 1911 census. I've knocked up a distribution plot of the Kennedy records here
http://www.kennedydna.com/news.html
Although Ireland has lost much of the19th century census returns they have (almost) made up for it by this service which must be the best online census I have seen. The final step will be the ability to search by all the fields including religion.