Question : Bandwidth monitoring

I'm looking for some software to monitor where the bandwidth is going on the network.

I've noticed lately that access to the Act! database on the server has become very slow (100MB network with 10 users) but I don't have any really good tools to find out why.  I've put a number of cheapy programs that tell me the percentage of bandwidth used, but they don't tell me who the offenders are. I'm going to evaluate NTOP, so don't suggest that one, I'm looking for new stuff.

It's a windows 2k server. Kudos to suggestions that will monitor my my linux boxes (snmp?) as well.

Points go to the best software (other than ntop)

Answer : Bandwidth monitoring

you'd want something to monitor on the network level, like layer 2/3 depending on your setup.  If you want to go hardcare, Ethereal or some other packet capture but it takes a lot of anaylsys and if you split your broadcast domains significantly you'll need to find a bottleneck point somewhere to monitor at. Maybe something like Nagios? http://www.nagios.org/

There's a Java based piece of software that I like for it's interface called Network Probe. http://www.objectplanet.com/probe/

Also HHDSoftware http://www.hhdsoftware.com/netmon.html