Comic BookDS V3.0. Also, a couple of replacement themes, because the supplied one is kind of ugly.
PictoDS - CBR/CBZ converter.
Of course, how well it works depends on the layout of the magazine/comic. I read American Splendor on it, The Skeptic, Computer Gaming World, Gamers Quarter; stuff with linear, narrow columns. A lot of magazines are simply incoherent at that resolution.