Adventure Comics #516: As he's also writing the current volume of Legion of Super Heroes, Paul Levitz is using the primary feature of Adventure to tell the story of the Legion's early years, and this issue is the big ol' exposition from beyond the grave by RJ Brande, who funded the LSH at the very beginning. Brainiac 5 is bored and snarky, Superboy is fascinated. Backup feature is the beginning of an Atom story - promising, but I don't know the character all that well.
Invincible Iron Man #28: Matt Fraction's run with this title has been nothing short of spectacular - he gets Tony Stark and his world. Tony and a handful of partners are putting a new company together, while IM and War Machine deal with the actions of Justin Hammer's widow and daughter. The Hammer Girls have their own powered armor operative, and they're out to prove its superiority.
Iron Man: Legacy #4: Legacy's got its own continuity going, and it's a lot of fun for this longtime IM fan. So far, this series has seen IM take on ethnicity-based civil war, deal with Doctor Doom, and now he's facing incarnations of three Cold War enemies - Radioactive Man, Crimson Dynamo, and Titanium Man. Writing's a little rougher than Invincible, but still good.
JSA All-Stars #8: I love the Justice Society of America and its history and place in the DC Universe, and I really want to like this title more than I do, but it's just not holding together for me.
Justice League of America #46: Part of the Brightest Day event, and the opening issue of a 5-part JLA/JSA crossover. Looking forward to how this unfolds, as the final page of the issue got my dander up.