We have made a relatively complex graph (193 nodes, 155 edges) and the 'pdf' export is absolutly great under gnu-linux (ubuntu 10.4). Thank's !
But the same file under windows (xp, acrobat reader 5.1) and also under mac os x (i don't remember the exact version) is useless. The result lack a lot of informations and misplaced.
I have installed 'yed' on a xp computer without better results. Lack of informations, misplaced ones, stack-up others.
Size of the export is A3, size of the graph is approximately 1942.5751953125 X 2755.5279746505553 .
You can see the graph in jpg here and have an idea of the pdf here
Nota : the pdf linked in the WnG article was made with ooo writer with the jpg.