Most of you will not know the amazing PDF Toolkit (pdftk)
It is a command prompt tool that allows you to manipulate PDF documents. rotate them, join two together, extract some pages, delete pages, etc…
So, what could be better than PDFtk?
PDFtk4all: A context menu for windows (windows shell extension, if you want to get technical) which performs all those actions on the selected file!
Have fun, and let me know what you use it for :)