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The official body responsible for the 6 counties
The official body responsible for the 26 counties
Trigonomy - A Yahoo Group.
This group is for discussion relating to Ordnance Survey triangulation pillars, flush brackets, bench marks, and other Ordnance Survey structures.
Supports Irish Structures
Trigpointinguk.com TrigpointingUK.com
Does not support Irish Trigs.
Simon Stewart's Hill-Walking in Ireland Lots of useful information.
Mountain Views A community site managed by Simon Stewart
A Hillwalking Resource for Ireland
Walking Assoc. Ireland A new, inclusive forum for hill walkers and ramblers all over Ireland .
GPS Utility An easy-to-use application that allows you to manage, manipulate and map your GPS information.
Freeware & Shareware versions.
GPS Trackmaker Most complete free program for GPS devices Compatible with more than 160 GPS models - Support for Garmin, Magellan, Lowrance - Eagle, MRL, Brunton and others - Easily create your own maps - Support for vector maps and images - Multi-Language - Completely free. No Adware, Spyware, ...
I use and recommend this software
Geograph The Geograph British Isles project aims to collect geographically representative photographs and information for every square kilometre of Great Britain and Ireland.

This link takes you directly to the Grid Reference Conversion page which "will convert Latitude and Longitude (assuming WGS84 datum) into Rectlinear coordinates. (Handles Both Great Britain and Irish Grids)."