The gay scene is concentrated in the 'Dublin 2' area. It's a friendly, close-knit scene where everyone knows everyone.
Rather than going to bars and then on to a disco, most of the huge bars double up as a dance club. Dublin has one of the fastes growing populations in Europe and is said to have more gay folk per capita than San Fransisco, with many of them being in a  young age group.

Dublin links...
June 22nd to July 1st. 2012 - Dublin Gay Pride - Web site
Gay Swimming Club - Email
Front Runners, Gay Running Club - Web Site
Outhouse, Gay & Lesbian Community Centre - Web site
Dublin Gay Switchboard - Web site
Gay Men's Health Project - Email

Ireland links...
Gay Community News (GCN) - Web site
Queer ID (QID) Gay News - Web site
Gaire. Blogs, Forums & Personals - Web site
Cork Gay Guide - Web site