ColdFusion 8 introduced server monitoring for single and multiple servers. This Flex based app provided access to all sorts of ColdFusion internals, alerts, proactive problem management, and more.
ColdFusion 9 takes this a whole lot further with a new tool called "ColdFusion Server Manager". This AIR based application allows you to monitor as many servers as needed (including individual ColdFusion instances on a multi-instance configuration) and even offers pop-up alerts when issues occur, it allows for remote server configuration (define a datasource, for example), it also allows for settings to be applied to multiple servers at once, it can clear the template caches, it can upload hot-fixes to one or more servers, and it even allows you to select two ColdFusion servers to compare their configuration settings, highlighting any differences between them.
Oh, and before you ask, here are answers to the three most commonly asked questions. 1: No, this is not a separately sold utility, it is part of ColdFusion itself (and installed via a link in the ColdFusion Administrator). 2: ColdFusion Server Manager uses APIs added to ColdFusion 9, so no, this will not work with ColdFusion 8 or earlier. 3: no, we've not made any decisions yet as to product editioning, so no decision as to whether this is an Enterprise only feature or not.