Not owning one of these devices, I haven't tried it myself, but for those who do, I saw a new app for purchasing and reading comics. Comics store locator included. :P
The app is ? surprise! ? named Comics. Discussion thread with announcement: http://episteme.arstechnica.com/eve/forums/a/tpc/f/34709834/m/623006360041?f=34709834&a=tpc&m=623006360041&s=50009562
It's also new potential distribution venue for the comics creators among us.