Don't know about a list of sponsors, but the only specific IT recruitment site I've heard of is:
www.computerjobs.ie, but pretty much every job site will carry jobs in IT. Depends on what is needed at the time.
Here is a list of recruitment agencies in Dublin:
http://www.movetodublin.com/recruitment ... in-dublin/ You will have to go through and see which of these are interesting. Then just contact them direct.
Of course you can check the company websites directly, e.g. Google/Dell/Yahoo etc. See here for a list:
http://en.wikipedia.org/wiki/List_of_co ... technology (not sure if it's accurate at the moment)
Jobs are also often advertised on:
www.linkedin.com.
Luck of the Irish to ya!
CC
PS: Could I ask which citizenship you hold? I guess you need a visa, but you might want to consider if any of your family members have European citizenship, e.g. through a parent/grandparent. That would make things easier!