Good website for Irish genealogists (both amateur and pros)

The pitfalls and outright fraud in Irish genealogy.

Sean Murphy's article The McCarthy Mór hoax is alone an amazing read.  

Also worth noting is A Guide to the National Archives in Ireland, and in particular,  the Report on the National Archives of Ireland Census Online Project. 

Examples of government bureaucracy and cronism at its worst, which can unfortunately affect one's genealogy research.