It has been mentioned in the past that we use
Acronis True Image in order to manage our x64 imaging needs. The procedure on how this was done, involved a mix of boot disks and the 32-bit version of True Image.
A couple of weeks ago, TrueImage announced the 64-bit version of both its workstation and server software. I just imaged an x64 server on the fly and it worked like a charm. Keep in mind that TrueImage allows you to create images without the need to reboot, which is a real time saver.
Now if only we could get an Itanium version...