When you install Macromedia ColdFusion MX 7 Enterprise Edition using the multiserver configuration, you can use the ColdFusion MX Administrator to create multiple server instances. Deploying ColdFusion MX on multiple server instances lets you isolate individual applications and leverage clustering functionality.

i really love this features! as you can isolates each system with own CF process enable high availability if the other processes die. plus you can replicate it's session from another machine with another machine makes user feel happy to browse your system application without knowing that which server is down!

p/s: this features comes not free! :P