Hey Marty, sounds like a great trip, I would sugest you get your hands on a copy of the British magazine Trout and Salmon, they have loads of info on fishing in Ireland including contact phone numbers. I believe in September you may need to check if the Salmon season is still open but you should certainly find some fantastic fishing on the loughs. Plus they have good estuary fishing in the south for sea run browns and even, I believe, pollock of the rocks.
Here is one link to try http://www.discoverireland.ie/Things...s/Fishing.aspx
and here is a link to the Irish central fisheries board http://www.cfb.ie/fishing_in_ireland/index.htm
Hope you have a great time, post some pics if you can, I would love to see some Irish salmon or trout!
All the best.
Mike.