SUPERMAN/BATMAN

Regular monthly series that ran for 87 issues and features the publisher's two most popular characters: Batman and Superman. Superman/Batman premiered in August 2003 and was an update of the previous series, World's Finest Comics, in which Superman and Batman regularly joined forces.

Superman/Batman explored the camaraderie, antagonism, and friendship between its titular characters. Jeph Loeb, the series' first writer, introduced a dual-narrator technique to present the characters' often opposing viewpoints and estimations of each other, which subsequent series writers have maintained.

See Batman/Superman 2013 series for the follow up series to this one. The first annual is pretty good too.

The series is reprinted in a number of Hardcover and Trade Paper Back collections:

Superman/Batman: Public Enemies (#1-6)

Superman/Batman: Supergirl (#8-13)

Superman/Batman: Absolute Power (#14-18)

Superman/Batman: Vengeance (#20-25)

Superman/Batman: The Enemies Among Us (#28-33)

Superman/Batman: Torment (#37-42)

Superman/Batman: Search for Kryptonite (#44-49)

Superman/Batman: Finest Worlds (#50-56)

Superman/Batman: Night and Day (#60-63, #65-67)

Superman/Batman: Big Noise (#64, #68-71)

Superman/Batman: Worship (#72-75, plus Superman/Batman Annual #4)

Superman/Batman: Sorcerer Kings (#78-84)

There are also two Absolute Hardcover Editions:

Absolute Superman/Batman Volume 1 (#1-13)

Absolute Superman/Batman Volume 2 (#14-26)

Some issues have also been collected in unrelated paperbacks:

Supergirl Vol. 1: Power contains Superman/Batman #19

Supergirl Vol. 2: Candor contains Superman/Batman #27

The Greatest Superman/Batman Stories Ever Told contains Annual #1.