It's terrific to know that the message boards, etc. really do work! I am still looking for these ancestors! Just recently I came across a Joseph Colhoun born 18 Dec 1849 at Corncannon, Parish of Taughboyne, Donegal to a William Colhoun and Elizabeth Rolston and baptised in the Church of Ireland on the rootsireland.ie web site. Looks promising and I'd love to claim him but certainly need something a little more substantial to prove they're my people.
Thanks again for the message!