read about gnucleus on cybergeography.org- I never knew the client had an inbuilt visualization tool!!

it's great, exactly the feature i was looking for!

for those of you also interested in network visualization,
there is an animated python module called "gnutella Vision" on

http://www.sims.berkeley.edu/%7Erachna/gtv/

it's pretty slow but a good tool because it's dynamic and displays the files on the individual hosts.

greets,
noci