heya.. hopefully not too late to add to the thread.....
Check out St. Vincent De Paul (or "Vincent's" as they are now known).
They have home visits for the elderly/disabled that are very worthwhile, and they also run charity shops to raise funds for other projects that they run in ireland.
I dont know if you have yet had exposure to Vincents, but they have a long history in ireland going back to when people were living in slums with one toilet for 20 houses, so they are long established, with a strong pedigree, and always looking for new volunteers.
If you have any interest, check out:
www.svp.ie