Self catering around Kenmare or Killarney, Ireland

Here are a couple of websites:

homeaway.com
vbro.com (affiliated with homeaway)
http://www.discoverireland.ie/ (this is the Ireland tourist page - with a good search for accommodations)

We are still researching, too, so can't help with specifics. What I have found are a lot of modern "resort" type places - those were mostly in the western tourist areas.

I have had luck with this website when looking for self catering in Ireland:

http://www.cottageguide.co.uk