The beta FON maps of Ireland show the growth of FON in the country. Most FON hotspots are in Dublin, but the other cities are there too, and there are also a number outside the cities. It’s also worth checking out the UK map to see the hotspots in Northern Ireland.
The maps are great, but that said, there are quite a few glitches with things placed in the wrong locations. I also know of a few hotspots that are missing. It will get straightened out.