I was under the impression that Ireland is/was the Celtic tiger (of Europe).
Unfortunately as soon as the EU cracked down on the corporation tax scams, eastern europe became cheaper and US companies cut back on golfing holidays they realized they didn't actually have an economy. But it was a great place to work for 10years - as long as you didn't buy a house!
As far as tax havens go we actually had quite a lot of people from those companies employed, it wasn't just your standard shell company running out of a solicitors office.
MSFT, Dell and HP both apparently lose money on all sales in Europe except those in Ireland.