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No best answer has yet been selected by cthulhu. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Sorry saxyjag that is wrong.
If you are a UK citizen you do not need a passport to go to the Irish Republic. Similarly Irish citizens do not need a passport to travel to the UK. There are no government immigration checks in either direction.
However, airlines need to check the identity of their passengers for security reasons. Different airlines have different policies on what they will accept. Passports, photo driving licences and official EU identity cards are invariably acceptable. Some airlines (ie not Ryanair) will accept other photo ids.
The UK and Ireland form a Common Travel Area
See
http://en.wikipedia.org/wiki/Common_Travel_Area
for an explanation. You need ID, not a passport, though that is OK if you have one.