www.mayo-ireland.ie This site is really almost one-stop-shopping! Just click on 'Towns' on the top bar and then click on the towns in Mayo that you're interested in, and pretty much everything you need to know is there - from places to stay, places to visit, things to do , etc. It even has a message board for people like us who want to connect with other Munnellys/Manleys! I have no idea how up-to-date they are however.
www.hotelballina.ie The rates will be going up the closer it gets to summer, so if you're interested, better book now! (Several of us are staying here). IMPORTANT: if you book at this hotel, mention that you are with the Munnelly Reunion in the comment box at the bottom of their registration page - that way they can get us in rooms close to each other.
Old Deanery and Island Winds are in Killala. They are great for families or larger groups who want to share the same accommodations (house). They are non-catering.