Whistle Blower (formerly Server Sitter) is a network monitoring utility. It's very easy to use and has a simple but elegant interface. It can perform regular checks of your servers and alert you if any of them fail to respond, and it can send email to you or your pager. It can also react to the failure by performing an action. Server Sitter can launch AppleScripts or other files to respond and can also control up to 4 powerkey modules connected to the machine to force restart a hung server. Version 3.1 - for OS 9 and OS X only - addresses the following:
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
For an interesting and objective third-party view of Apple's networking technology - from MacTCP through Open Transport and beywond - Peter Sichel's Sustainable Softworks page is unparalleled.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!