Glad to hear that... I do believe it will work with Bookman and other comic apps too, as you've probably discovered, somehow it can detect what file types open with which installed apps.
As far as I know, FileBrowser is the only app that works so seamlessly with an Airport Extreme USB disk. I always wondered why Apple didn't have a native client for iPads to access AE disks ("AirDisks"). But FileBrowser takes care of that!
Yup it works with bookman! Great little program. Thanks again!