If you don't want to shell out the bucks for more expensive comic reading apps, GrassGames' Comic Reader is a nice free app. It has only a few features, but they all work nicely. I did have some trouble opening PDF's, but CBR's and CBZ's opened just fine. There isn't much in the way of configuration and there is no double-page support. Aside from all that, it opens my comics, they look good, I can pinch zoom when needed. That's about all you can expect from a free app, and that's exactly what this one delivers.