Let's see - I missed the Glengharry Bhoys completely, but caught Scythian (good), Penny Whiskey (good), Greenwich Meantime (eh), The Dublin City Ramblers (more relaxed than I generally care for, but very good).
(It sort of says something, doesn't it? I wouldn't normally listen to relaxed Irish folk music, but my brother and I stopped and listened to them.)

For a good bit of light entertainment, Seamus Kennedy was there this year. It was interesting to see him split the one show I did see between his adult material (sanitized for a family audience) and his children's material.
And his outfit was something to see:

With the lighting and distance from the stage, this is the most in-focus picture I took. Of course, my camera may have kept from focusing as an act of self-preservation.
Well, it can't be a kilt don't if there's no photographic evidence, can it?