Pdfposter can be used to create a large poster by building it from multiple pages and/or printing it on large media. It expects as input a PDF file, normally printing on a single page. The output is again a PDF file, maybe containing multiple pages together building the poster. The input page will be scaled to obtain the desired size.
This is much like poster does for Postscript files, but working with PDF. Since sometimes poster does not like your files converted from PDF. :-) Indeed pdfposter was inspired by poster. For more information please refer to the manpage or visit the project homepage