Please help - need to find an iPad app ASAP that has the ability to tag and/or categorize PDF files from within the app itself. I'm essentially looking for an easy way to be able to view these business-related PDF files multiple ways: > By Capability > By Customer > By Business Unit > By various tags that can be given to each file within the app > etc. With iBooks, you have to do the categorization using iTunes, and I don't want that (it's also limited to only 1 category per document). Any help with this would be GREATLY appreciated! Thanks!!