Definitely a work in progress.

History pin
http://www.historypin.com/

The national Library There is a fair collection of resources online here, but to realy get value out of this for your class you should visit the building.
http://www.nli.ie/
A general non commercial website on Irish history. There is a lot of material here and it can be easy to get lost.
http://www.irishhistorylinks.net/

A nice site with an emphasis on the Leaving Cert
http://www.templehistory.dna.ie/

Scoilnet in-service support page for LC history
http://www.scoilnet.ie/hist/

and, from the same source, the sylabus for ordinary and higher levels
http://www.scoilnet.ie/hist/Docs/lc_history_sy.pdf

Some blogs fro Kay ....? of Lucan community College who posted these suggestions on the CESI list

www.juniorcertificatehistory.blogspot.com

www.leavingcertificatehistory.blogspot.com