Is there some way to take PDF articles I have downloaded and combine like ones into a PDF ebook? I have no problem with having to buy software to do this, but I don't want to get something that won't work. I tried using mobipocket creator and importing the PDFs but it only lets me import one file or else I just don't underatand how to do this. I am not computer illiterate but have no experience with anything like this. The articles I download are medical in nature and I would like to group together those dealing with certain condtions or drugs and such. Right now I have 400 and some separate articles downloaded, makes it difficult to find what I want. Any suggestions are appreciated.