There's a Revenue leaflet here[/url:1j5cb5bk].
Full beer duty is €19.87 per hectolitre per cent of alcohol, making microbrewed beer €9.94.
[i:1j5cb5bk][b:1j5cb5bk]2010 Update: [/b:1j5cb5bk] now €15.87 full, €7.94 for microbreweries.[/i:1j5cb5bk]
So the duty on a 500ml bottle at 5% ABV is 25c ([i:1j5cb5bk]2010: 20c[/i:1j5cb5bk]), by my reckoning. Is that right?