Ryanair have no extra aircraft in DUB than 2009/2010.
Summer 18 based.
March - May 16 based
May - September 18 based
September - October 16 based
Winter yet to be confirmed but will be more less the same as 2010/11 and Ryanair handle all there flights.
T2 - Check-In
Eithad - Desks 1 - 4
Delta - Desks 5 - 12
Continental - Desks 13 - 17
US Airways - Desks 18 - 23
American - Desks 24 - 28
Aer Lingus - Desks 29 - 56
Delta may also use some of EY/CO desks as I was there on Friday as a passenger and they had 6 desk open for the 767 to JFK at 14.10. I think they use 6 - 8 for the A330 to ATL.