Monitor network use

I have set up a snow leopard server at a small publisher's. There are Macs of many shapes and sizes. Traditionally, there have been no restrictions as to use of the machines, and we do not wish to impose strict guidelines. On the other hand, resource hogs need to be identified and, er, guided.
Furthermore, the entire system as it works now (an old macos x server runs dhcp and filemaker server) is a bit shaky, so I want to migrate it from the old osx server to the snow leopard server.
I'd like, then, to know of software solutions (open source, commercial, doesn't matter much) that can tell me
1. Which disks are full?
2. Who uses too much bandwidth?
3. Which computers are down?
4. Whatever else that might be good to know
Any and all suggestions are welcome. Thank you.

the iPad doesn't allow apps to monitor other apps, to prevent viruses. So there is no monitoring app for the iPad. Sorry.

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