When rendering a page as a PDF the filename of the PDF is the name of the page which is not a good thing. The problem with this is that the name is not unique and can cause confusion with the user.
I'm working on a quoting app that renders a quote as a PDF. Some broswers open the PDF embed, others automatically launch your PDF reader, and some prompt you to save or open. The problem is that if opened or saved theses files are all saved as qoute.pdf, qoute.pdf, quote.pdf, quote.pdf. The problem should be obvious.
Ideally you should be able to define the name of the generated PDF but I haven't figured out how to do this.