This day seems to never end. I did some birthday party preparations, fixed lots of small bugs, solved many small problems, Netsaint2mrtg goes along very nice. I have made modular support for plugins and disabled ping monitoring, since most of the hosts are on the local network and ping 0 ms anyway. Zillions of bugs are fixed and several design problems corrected.
I have also found out that Windows machines are not particularly interested in doing push installations from Samba shares of machines which disallow TCP and UDP connections to port 445. Fast grep of /etc/services reports some microsoft-ds. :) By the way, Samba should also be allowed with ports 137-139 open.