Action Comics, Justice League, and Batgirl previously were announced by DC Comics as going to third printings of their first issue, and now Detective Comics and Swamp Thing join the crew.
Detective is a natural: along with Action and JL, it is absolutely considered a flagship book for the company. Likewise, Batgirl received a lot of attention from the media (us included) due to the miraculous healing of paralyzed Barbara Gordon, placing her back in a walking, running, jumping costume. Swamp Thing is a bigger indication of the diversity of stories being told in the New 52, though, and the fact that they are also selling well.
Justice League #1, so far, is the only one of the titles on its fourth printing. The second issues of the week one titles, including both of these new additions to the third printing club, hit stores tomorrow.