Some interesting recent articles on tax inversions and Irish role as a tax-conduit to tax havens:
US Treasury new rules tightening tax inversions: http://www.treasury.gov/press-center/press-releases/Pages/jl2645.aspx
And Irish reaction to these: http://businessetc.thejournal.ie/us-tax-inversions-ireland-1685263-Sep2014/?utm_source=twitter_self and here: http://www.irishtimes.com/business/economy/us-launches-crackdown-on-overseas-tax-avoidance-1.1938583
While markets broader impact here: http://www.reuters.com/article/2014/09/23/us-usa-tax-inversion-idUSKCN0HI1WK20140923?feedType=RSS&feedName=topNews&utm_source=twitter
Here is a more detailed discussion of the net impact of the new rules, mentioning so-called 'Levin solution' http://fortune.com/2014/09/24/the-treasurys-chicken-soup-take-on-tax-inversions/
And an earlier article from Arthur Cox solicitors on the benefits of inversions into Ireland and associated restrictions: http://www.arthurcox.com/wp-content/uploads/2014/07/April2014_SpotlightOn.pdf Hilariously, the above quotes: "Ireland is a popular country for inversions because of its favorable tax regime and extensive tax treaty network."
And an official response from Ireland to US tightening is 'not our problem': http://www.irishtimes.com/business/economy/kenny-defends-us-firms-irish-presence-1.1939192#.VCKA645RJ3A.twitter
You can track previous articles and posts on Ireland's role in global tax optimisation by searching this blog for "corporate tax".