The amount of quality blogs that focus on Irish genealogy has steadily increased over the last five years. The two that stand out from the crowd are Claire Santry's Irish Genealogy News and John Grenham's Irish Roots. Blogs in that crowd include Margaret Jordan's Cork Genealogist, Kay Caball's My Kerry Ancestors, Donna Moughty's Irish Genealogy Resources, and without jumping on the self-praise bandwagon, hopefully Townland of Origin.*
There is one blog, though, that teaches me something new with almost every single post: Journey Home Genealogy. It is written by Dwight Radford, who is one of the foremost experts in the US when it comes to Irish genealogy. Blogposts frequently focus on methodologies, sources, and experiences researching in Ireland, and among Irish immigrants in the U.S. and Canada.
If you don't know your Tithe Applotment Books from your Griffith's Valuation, or are still looking on Familysearch for that 1861 Irish census database, then you might want to come back to it in the future. Basically, by that I mean that this blog is aimed at intermediate and advanced Irish genealogy researchers. Irish records in Spanish archives? Check. Correlating city directories with censuses in Ireland? There is some of that too. Irish Immigrants in a multi-ethnic parish? That's covered.
The blog is usually updates 2-3 times a month and you can sign up via email to follow it. It's definitely one to check out.
* I have not considered blogs from commercial companies that have a large number of Irish genealogy records and databases.