I love the Stacks feature and use it all the time, but sometimes I'd like to have one particular file sitting apart on the desktop and not be included in a stack. In this case a particular PDF of a book I'm reading, I want it to sit by itself and be clearly visible on the desktop so I'll remember to open and read it now and then. But I'd still like the rest of my PDFs to stay in the stack. Is there any solution to this?