Well ... I concur with mmkhan to...but if you're looking for a more expensive solution you could check out Microsofts MOM 2005 - LINK

It's especially useful when you have a Microsoft environment, but it can (with third party plugins) be used to monitor Unix or Linux systems too ...as well as it can be used to monitor Cisco and 3Com equipment (and other brands to, but all with third party plugins) .
I've implemented it for a big international firm and they are very happy with it.

It can monitor services, eventlogs, hardware, mailflow (exchange), SQL databases etc...
It provides reporting through SQL reporting tools, which can deliver detailed reports on failures or network usage through email or on shares daily or hourly or whatever.
It provides a extended knowledgebase allready incorporated which gives you vallant information on the problem or incident reported in the operator console.

It uses Webconsoles which provide a non admin access to the console so easy to give access to a coworker who just needs to monitor.

it provides possibilities to send emails, paging etc...
You can write custom rules and scripts to monitor custom applications... I wrote a custom rule to monitor RFID entries in the eventlog because the packet to monitor the SAP environment wasn't yet available then.

There are numerous possibilities that can be done with MOM 2005 ..but there is also room for improvement ...that's why SP1 for MOM 2005 has allready been made available... but if this product keeps evolving the way it does it will make a product to watch for in the future.


Just thought I mention it

C.