I haven't made it it Ire, yet, but there seems to be a lot of great hand-lettered pub signs all around England. In this vein, I'd check out stuff from LHF Stratford might be one to look at.

If you wanna beat the cliché, pick an uncial: FontShop, MyFonts. Typophile Dan has compiled a list of gems, and he has designed a nice one himself, too.

I searched on kells at myfonts.com and got some possibilities, although "irish uncial" would probably give you much the same results.

Later edit:

Dining Pubs and Irish Music Bars have extensive lists of Irish pubs, along with photographs; although the photos are somewhat small, you can often see the signs pretty well.

Go to:
http://www.scribhinn.org/gailear.html

The page is in Irish, but if you scroll to the bottom you will see a photo of a book cover flanked by arrows to the left and right. Click on either arrow to navigate forwards or backwards through a gallery of images of Irish typefaces employed in different contexts.

The gallery contains several pictures of Irish pub signs.

This may or may not help...
Gaelic script

and some pubs in and around Belfast...

The Hatfield

Magenniss

Kellyscellars

FibberMagees

alot of pubs in Ireland go for a more contemporary look these days...

JohnHewitt

Sorry, first link didnt work. Try here...

http://en.wikipedia.org/wiki/Gaelic_script