|Telephone Subscribers of Ireland 1900-1901|
He's updated his Census Image Browse tool, which allows you to move through the 1901 and 1911 census returns as if using microfilm, and in the process find the returns of incorrectly identified townlands. He's also created a new BMD Browse Tool to allow you to move easily through GRO register books when searching for civil registrations via IrishGenealogy.ie. (The links I've given you here link to Shane's respective blogposts and a clear explanation of how to use each tool properly.)
Another recent addition is a scanned booklet of Telephone Subscribers of Ireland 1900-1901. It covers Dublin City and several towns in Leinster (Drogheda, Dundalk, Naas, Mullingar, Wicklow, New Ross, Wexford, Enniscorthy, Kilkenny); plus Belfast, Newry, Strabane and Londonderry in Ulster; and Cork, Limerick, Tralee, Galway, Clonmel, Waterford, Sligo and Clonmel in the south and west of the island.
Everything on Shane's site is free to use, access and view. If it isn't there already, be sure to include it in your Bookmarks or Favourites folder.