Hi, Please read this detailed message and help. It is a bit long because I have tried very hard to get what I need - and failed. So I am being very specific in my query. I recently bought an ipad with one express purpose - to read, organize, and annotate my large collection of scientific pdfs. I have the following requirements, and I have tried a number of solutions, and none of them have worked for me. I would like to know if ANY app can fulfil my need - else my ipad purchase is a waste. (BTW, this is my first foray into the Mac world; I have only used PCs so far, and a good friend persuaded me to get into the Mac Universe. But this first experience is very frustrating. So, relevant information here is that my desktop machine where I have also loaded itunes is a windows machine.) So, here are the requirements: 1. I need to be able to organize - sort and search by TAGS - my entire collection of scientific papers so that I can retrieve a paper very quickly in a search. 2. I would like full-text search on my pdfs. 3. I would like to search multiple pdfs simultaneously in full-text search. 4. I would like to annotate my pdfs, more the better - handwriting, etc. 5. I want to be able to use iTunes to upload and save documents from the app. I DO NOT WANT TO USE DROPBOX, etc. I see absolutely no sense in spending $10/month on online cloud storage (of 100 GB) when I have an external hard drive for 1 TB that I bought for $100. (as an aside, I find it amusing that on various websites, ipad owners complain so much about a "pricey" app that sells for $7 (one-time cost) but are willing to happily fork out $10 a month to store their data on the cloud. Well, I am not happy paying for this. I think the entire dropbox/etc. move is a scam.) Plus my iPad has 64 GB, so it can easily store whatever I want to store on it. I should point out that my collection of pdfs is quite large - a total of more than 10 GB. That means that with most services like dropbox, etc., I will exceed the free storage limit of 2 GB or 5 GB or whatever (most apps only have dropbox connectivity, some have other options too), and I cannot store my files on cloud servers. Now let me tell you what I have already tried: Documents 5, PDF Express 5, GoodReader, Sente, Papers, colwiz, Evernote, and Mendeley. None of these satisfy all the requirements stated above. For example: Documents/PDF Expert 5 have a wonderful multiple file search, but they don't seem to have a proper tagging system where you can assign text tags to individual papers and search by tag. For example, I may have different papers dealing with "bubble columns", "stirred tanks", "computational fluid dynamics", "chemical reactions", etc. - and more than one tag may apply to each paper. I would then like to be able to search the papers by searching for these tags. In addition, I would also tag the papers by the authors, etc., so e.g., search for "Smith" "stirred tanks" "mixing" tags and get all the papers dealing with these. I could try to manage with multiple file search, but searching on 500 or 1000 papers is not easy. Folders will make it easier, still, I prefer tags to folders because folders are too limited. For instance, what if a paper concerns both "stirred tanks" and "bubble columns"? Which folder would I put it in? Many of the "reference management" softwares, like Sente, Papers, colwiz, etc., can do parts of what I want - for instance, all of them will allow you to categorize papers by authors, journals, subject, etc., but most of them are tied to the cloud, which will make them expensive options for me. colwiz, for instance, uploads whatever you import to their cloud storage - and you only get 2 GB. If you refer some friends to their service, you can bump that up to 3 GB. Right now there isn't even an option to get more storage by paying, but I can bet it will be expensive - at least $5 per month - and I don't wish to plonk down $60/year. Besides, the main function of reference management software is citations, and I am not particularly interested in citing, more in reading. I work in industry and we rarely publish - though we read a lot. And I don't mind manually inputting authors' names as tags - something the reference managers do for free for me - if I can get the other functionalities I want - sync with iTunes, tag-based sorting and searching of pdfs, full-text searching of pdfs, and some annotation at least, if not the best - the last I can negotiate a bit on. I looked at a few reviews of software such as DevonThink, that seem quite interesting, but apparently it is useful only if you already own a mac, which I don't (yet). Also, I searched a lot for file managers, and a few, like OrganiDoc HD, seemed like they may be good for file organization, but did not have enough PDF annotation capabilities. Any hope for me? Thanks, Kumar Is there anything out there for me?? Or should I just toss the ipad??