Making a big poster? OpenOffice Impress is the tool for you, even if it appears to have PowerPoint-like limitations. After Google let me down, I found this tidbit buried far too deep in the OpenOffice.org forums. Once again I'm blargging to get this in Google's archive.
Here is what you do when the OpenOffice Impress GUI tries to limit the size of a slide.
Unzip your .sxi file
Manually...
