In reply to Juicy Lucy:
If you're operating at upto VS/HVS (grade spread appears to be in lower range), then Gola is a pleasant location. There's a regular ferry across there now (cost is €10 return and sails from Magheragallan pier near Derrybeg; ring 087 6607003) and plenty of water is available near the harbour (you'll need water containers though!). Cliffs are excellent granite (IMHO a little short - upto about 30m or so in height), a kind of mini-Lundy experience.
I thought Malin Beg was a little dissapointing.
Dunmore Head has some good climbing, but again its a little short.
Weather permitting, the Poisoned Glen is meant to be very good.
Great county and, surprisingly (at least relative to climbable cliff heights) it has the largest sea cliff in europe (2nd largest in the world) - sadly, its not very climable!!