Some more:

Dineen's dictionary (in modern type face). http://www.ucc.ie/celt/Dinneen1.pdf

An electronic dictionary of the Irish language. http://edil.qub.ac.uk/dictionary/search.php

Various things from Ciarán Ó Duibhín with an emphasis on Ulster.

http://www.smo.uhi.ac.uk/~oduibhin/