InterMapper has published four white papers on network monitoring, mapping and alerting and InterMapper. You can find them all at
http://www.intermapper.com/resources/whitepapers.aspx .
The papers look at “Top 8 reasons SMBs need to monitor their networks,” “top 8 considerations for selecting SMB network monitoring software,” “10 steps to streamline the deployment of network monitoring software for SMBs,” and “6 ways to calculate returns from your networking monitoring investment.”
InterMapper is Mac OS X compatible network monitoring software. It uses SNMP to monitor the network infrastructure, and has probes for monitoring many kinds of servers, including web, mail, LDAP, FTP, etc. More information and a free 30-day demo are available at the product Web site (http://www.intermapper.com). Pricing starts at US$495.