ComicRack is a very popular comics viewer and organizer for Windows. It is also available for Android and CyanogenMod as ComicRack Free. I tried it when my favorite A Comic Viewer started throwing out of memory errors on some CBR files.
ComicRack Free is a great little app. You can ask it to scan one or more directories for comics files. It handles popular formats like CBZ and CBR with no problems. It shows your comics collection beautifully with all their cover pages. You just flip left or right to turn pages forward or backward. A tap on a comic page brings up the thumbnails viewer to view the pages. One other feature I like is that it can be configured to intelligently crop out the white matter around a page, so that more of the content gets the precious screen real-estate. Since the app is free, it displays ads when your tablet is connected to the internet.
I like this more than A Comic Viewer because its page flipping is much more natural and faster.
Tried with: ComicRack Free 1.78, CyanogenMod 10.1.2-encore and Nook Color