http://www.ireland.com
The Irish Times - News and weather.

http://www.gaa.ie
The official GAA site.

http://www.irlgov.ie/
The Government of Ireland website.

http://www.browseireland.com
Directory of Irish sites.

http://www.ireland.travel.ie/home/
Irish tourist board - The official guide and a comprehensive presentation about visiting Ireland, with accommodation, activities, events, contacts and maps

http://lonelyplanet.com/destinations/europe/ireland/
The Lonely Planet books have details on countries all around the world. Here is their guide to Ireland.