Reading comics, particularly on tablets, is a delightful use of bright, vivid touchscreens. If you're a heavy reader and want to bring your own files, Astonishing Comic Reader is a relative newcomer with a ton of slick features.
Create collections to group related comics together
Add tags to comics for easy searching
Take and store snapshots of favorite pages
Options to navigate with gestures, on-screen buttons, or volume buttons
Where It Excels
Astonishing Comic Reader is a relative newcomer that has one of the nicest-looking interfaces we've seen in a comic app, by a pretty big margin. In addition to looking great, you can import comics from Dropbox, which means you never have to fiddle with USB cables or whatnot.
On top of that, it adds a bunch of organization features that several other apps don't have. You can create customized collections of related apps for easy sorting, tag collections so you can search them easily, and even mark certain individual comics as your favorite. You can also take snapshots of panels or pages you enjoy to save for later.
You can also set the reader to night mode, to reduce glare while you read at night. You can also choose to navigate pages by tapping the sides of the screen, pressing on-screen buttons, or by using the volume buttons to go back and forth. There's even support for displaying your comics on the Chromecast
Where It Falls Short
All of that organization is great, but one of the best features seems entirely broken. The app's description claims that it can sync your collections, favorites, and reading statistics, but in my experience only the latter worked completely. While it may work with some fiddling, it's not nearly as seamless as one would expect. It also doesn't sync your comics themselves, but if you're using Dropbox, it hardly matters.
The last time we looked at this, we chose Comic Rack for having some great reading features, and offering sync with your desktop for $8. The close runner up was Komik, which offered similar library support to Astonishing, though it lacked any syncing capabilities. Both are fine options if you want a bit more control over your reading experience.
Also, these ignore the branded digital comic book stores that are available. Comics (from comiXology) is the broad, catch-all app that allows you to buy and read comics from DC, Marvel, and a bunch of other publishers. For the fanboys and girls, specific DC and Marvel versions of the app are also available, though you can access both collections in the main Comics app. This trio of applications offer fantastic reading experiences, but you can't bring your own files, which is a huge downside for fans. If you don't have your own collection already, this can be a great way to get started. Also, they have pretty great sales regularly.
Honorable mention also goes to A Comic Viewer and Perfect Viewer. These two aren't quite as feature-packed or as nice looking as ComicRack or Komik, but they're fairly straightforward and support a much wider range of formats.
Lifehacker's App Directory is a new and growing directory of recommendations for the best applications and tools in a number of given categories.