So I originally picked up Crysis 2: LE from Direct2Drive - I've been messing around with origins to see if it is any good (it's "OK") and managed to register my copy on it.
So go! be free! enjoy HD patches for Dx11!
Somebody mind trying a few CnC titles?
EDIT: Confirmed, Red Alert 3 registered perfectly. Haven't seen how far back it can go yet.
Quite handy if you want to backup any EA games at least!
EDIT2: BF2/SF isn't working :( shame about that, but BC2 has.