This is exactly what I needed, thanks a million!
-J
It actually seems to work quite well. It is currently only for Linux,
but it has been included in the nightly snapshots for some time - you'll find it at http://www.hswn.dk/beta/
The clients must be updated, so they report the raw "ifconfig" data (for Linux - there are some other commands for AIX, Solaris and HP-UX, but I haven't done the server-side parsing for these OS's yet).