One thing I find that's unique about Dublin is expression in the form of stickering poles and other public works around the city. Some of the signs are funny: "Girl Cows Make Milk"
I found stickers protesting the housing tax in Irish and English.NAMA is another popular target: "NAMA Operating in the area. Warning: May cause 10 years austerity".
Visitors can learn a lot about hot topics in Ireland just by watching for these signs various street corners.