I have bought a new iPad on Saturday and I found it to be a great piece of hardware. I've already installed several apps and I'm in search of something a little more specific for handling PDF files. I have a library of 500+ journal articles in PDF. Each of them is several pages in lenght (some of them have more than 100 pages) and the text is searchable (I've OCRed them all). Now I would like an app to search the text inside all of these files. In an ideal world, I would like an app that could index all these PDFs and return the results of any search within seconds. But an app which is able to perform a search of the full text of this library of PDFs will do. I currently have Papers for iPad installed, but it cannot search within the text of my papers (only the desktop version, for Mac, is able to do that). It seems to me that apps such as iAnnotate, PDF Expert and DevonThink To Go might have the features I need. But are they powerful enough to handle a full-text search of a 500+ PDFs library? Which would be the best for this purpose? Thank you in advance.