The posterkit-1.1.tar.gz archive contains all you need to duplicate the example poster. Copy the files somewhere, and type
latex posterYou'll need to use LaTeX2e, and probably teTeX. To preview at a reasonable size, use
xdvi -hush -s 15 -paper 118.8cmx84.1cm poster
To print, use
dvips -P a0 poster.dvi -o
a0poster.cls and
a0size.sty must be in the current directory, or on your
TEXINPUTS path. When dvipsing, config.a0 and
a0header.ps files should be in the current directory.
For other problems, let me know at awf@robots.ox.ac.uk.