"You Two! We're at the end of the universe, eh. Right at the edge of knowledge itself. And you're busy… blogging!" — The Doctor, Utopia
Need to do some basic manipulation of a PDF file like rotating, removing, cropping, or reordering pages? Check out CutePDF Editor. There is a file-size limit of 10MB but I’ve found that it does just about everything I’ve ever needed do to a PDF including the wonderful ability to merge multiple documents into one.