DiceBook icon Under normal circumstances, it would take something pretty special for me to recommend more than one app in a particular category for the iPad. Does anyone really need more than one CBR reader when Comic Zeal does the job so well, for instance? Or more than one Twitter app, or RSS reader, etc.? (E-book readers are, of course, a special case, given that so many of them only read their own DRM-laden formats.) So when it comes to PDF readers, why would someone want anything other than the inexpensive, powerful, and fairly easy-to-use GoodReader? Actually, there is a pretty good...