Does anyone know of any sites with guitar tablature for ITM?
No I bet some of the Melbay crowd have volumes of it for sale. Tis a pity one cannot go into their office and crown the eejit who makes those books… better shut up before the Police come by!
Theres bound to at least one 
I googled this: guitar tablature irish music.
Mostly I came across books for sale, some of which might be good. I think you might be able to find a good website if you were willing to spend some time looking. I spent about 15 minutes, let’s say. So I didn’t work real hard at it, but I didn’t find anything good and free.
Also, if you don’t get much response here, you might try putting up a thread like this in the Stringed Instrument Forum. Some of those folks might know some websites right off hand. Good luck!
Mel Bay publishes some good books. You leave him alone! 
Thank’s Cynth…damn that Melbay 
http://www.alltabs.com/celtic_guitar_tabs.php
Also, you might want to ask in the C&F Traditional String Instruments
Forum, since there are bound to be Guitarists who read that.
This site bills itself as Chords for Folk Songs, but it’s got lots of Irish tunes mixed in with the folk songs.
http://folkguitar.us/chords/index.htm
Thank’s for all the replies
Many if the Irish are folk, too. 