There's quite a few expats on here so let's be hearing it...
The things that irk you in a certain way no matter how small. For me it has to be the bloody pathetic internet.
UPC (the best in Ireland) - 50mb/40 Euro a month.
Virgin Media (standard UK) - 100mb/33 Euro a month.
Also, transport in Dublin. 2Euro something to go into town from Phibsboro. In France I went from Nice to Monaco for 80cent!