Hi Glf
I don't have a definitive list of airports nor timescales but in a Eurocontrol brochure from July 2006 they say that A-SMGCS will initially be introduced at:
Amsterdam
Brussels,
Copenhagen
Frankfurt
Geneva
London Heathrow
Milan Malpensa
Milan Linate
Paris CDG
Paris Orly
Prague
Rome Fiumicino
Vienna and
Zurich
'further implementation is foreseen' at
Palma De Majorca and
Madrid