As "Transformers: Revenge of the Fallen" steamrolls the box office this weekend, iPhone readers are lining up to buy .99-cent digital comics in the Apple iPhone store. Transformer tie-ins now occupy the #2, #4, #6, #7, and #11-14 slots on the "Top Paid Apps" in the books category of the App Store.

Produced by IDW Publishing, the apps are digital versions of a comic book prequel to the film. The robot movie reaped $60.6 million on opening day alone, and readers are paying to read these special e-books as well. If you want to read more, one UK blogger reviewed the digital comics.

Here's more from the promotional materials: "Can't wait for the Transformers: Revenge of the Fallen movie? Get a head start on with the film's official prequels, Revenge of the Fallen: Alliance and Revenge of the Fallen: Defiance! Delve into the Transformer's recent and ancient past as these stories lead up the the events in this summer's blockbuster."