Due to the success of the FastPass Kiosks at Dublin Airport, Aer Lingus have announced that they have expanded the service at LHR by 8 kiosks. And, the airline has announced plans to install further kiosks at ORK, SNN and JFK over the "coming weeks" according to aerlingus.com
On a personal note I have used it and I found it to be the best self-service check-in around. I've used AA, CO, US, DL, EI, BD and BA and this system is amazing. You can even use it when travelling on a paper ticket . . . recently I travelled DUB-LHR-JFK (EI/AA)and obtained boarding passes for both segments. The baggage drop was very simple . . . kudos to the airline for this development. . . . and I have been a long time critic! And, for us nuts who collect boarding card stubs they even issue real boarding cards!