Recently got interested in collecting the trades for the Cassandra Cain Batgirl series, but I'm really confused about how to get everything.
Wikipedia lists the following "main" collections: Silent Running, A Knight Alone, Death Wish, Batgirl: Fists of Fury, Robin/Batgirl: Fresh Blood, Kicking Assassins, Destruction's Daughter, Redemption, Silent Knight, To the Death, and Point Blank. However, comparing Silent Running and Silent Knight, it appears that they are copies of the same materials, making it seem like the last three were reprinting the original volumes in a larger format (sadly, it looks like they stopped short of completing the original run, if so).
Also, if a cross referencing of the Batgirl trades, plus the issues contained in "event" story trades is conducted, it looks like Batgirl #15 - 16, 22-23, 25, 30 - 32, 34 - 54, and 57 have never been put in trade paperback form for some odd reason.