In reply to halfaseesaw: There are some brilliant areas for climbing, however they are all REALLY spread over the county. Normally, this wouldnt be such a problem but Donegal is a BIG county. Try either SW (Skelpoonagh bay, Malin Beg, Muckross Head etc) or N (Dunmore Head - Culdaff, Port a Doris, Barnanmore etc). A good place to get guidebooks, maps etc is
http://www.jackson-sports.com/ free postage to uk. Only 1:50000 maps available for Donegal unfortunately!