I'm just collecting them as I can't read Japanese yet...but I find I have bought at least one pack of most of the Weiss side
Namely, DC/DCII
Little Busters
LB Ecstasy
Zero no Tsukaima
Lucky Star
To aru Series
Haruhi
Clannad Vol. 2 and Vol. 3 (new)
Angel Beats
and Disgaea.
Incidentally, when forming a deck does it have to be ONLY of the Weiss or Schwarz side?