Well, If a Windows 2003 Server is installed, the administrators will allways check there System Logs, The Microsoft Management Console (MMC) will also be used for checking some dictonary logs.
You could use some programs for checking you Bandwith use, the number of ports that are open, in & out going traffic.
If you want to protect your self against the newest exploits then it would be allways handy to do as much updates you can. Also have a Virus scanner & Spam killer installed. If you want to do it real good you could put some Hardware Firewalls in the system and use Web & Mail Sweep for checking out all the in en out going traffic.
Well hope some guys knows some nice porgram titles. I don't :S Sorry