eoin - it's a bit over the top for some people, but one of my favourites is the Hairy Bowsie's "Publocked" album, which is (for those unfamiliar with it) a fantastic parody of republican ballad bands - a bit like the a hardcore version of the Wolfe Tones on speed. It's not for the easily offended, but it's bloody hilarious.

And if you're looking for quality satire, may I recommend a read of our own Campsite at Drumcree threads (all 5 of them - and still more peripheral ones).