I'm an avid fan of the Virtual Appliance concept so you'll see a lot of articles on this site about VA's.  Wikipedia defines a virtual appliance thusly:

“A virtual appliance is a minimalist virtual machine image designed to run under Parallels, VMware, Xen, Microsoft Virtual PC, QEMU, Usermode Linux, CoLinux, Virtual Iron, VirtualBox or other virtualization technology.”

USEast has plans to enter the VA business at some point.  We'd like to be the first to ship a VA based on ISA Server... just waiting for MS to allow us to do it.  What do you think?  Good idea?  Read more at the link below.

Need it quick? Use a virtual appliance to get up and running in no time

Servers and Storage | TechRepublic.com