One of the apps I'm using to most is the Marvel Comic reader. This app is gorgeous on the iPad. When reading a comic simply swipe your finger to move from page to page, similar to iBooks but the the coolest things is double tap the screen and it draws in cell by cell. This way only one cell is on the screen at a time and it's blown up to take up the entire iPad screen.
Also in the app you can buy more Marvel Comics. There are several that are free including the first Incredible Hulk and others that you can buy for $1.99 a comic.
This is an app that you should defiantly download and check out. If you're not sure try out some of the free comics.