Are you whating to make a super sized poster but only have an A4 printer?
Well then you need this great little tool.
Its called PosteRazor, what it does is takes your image that you want to turn into a poster, stencil or what ever and turns it into a multiple page PDF file. You chose you what size you want the poster to be, the overlap of each page for easy asmeblement if you want any, page format, amoung other options. To create your super sized artworks.
Check it out