Update (2022): This app seems to be dead now.
The tablets and mini-tablets running Android or CyanogenMod are great for reading comics. There are lots of classic old comics that are available as CBZ and CBR files. A Comic Viewer is the most simple and easy app to read such comics on Android. Tap anywhere on its home screen to open files or change settings. Comics can be displayed to fit the width, height or screen. It is a simple app, so it does not come with any features to organize your comics. And also, I did get a few out of memory problems when viewing CBR comics. But other than that this viewer would be a great recommendation for everyone.
Tried with: A Comic Viewer 126.96.36.199, CyanogenMod 10.1.2-encore and Nook Color