As I know that new version of Cisco Call Manager (version 8) is working based on VMWare (and it is must), so I am asking if there is a versions for IPCC and CVP working on VMWare (this for production and not for LAB).
UCCE 8 on VMware 4.0 on the Cisco UCS hardware only.
But in a lab environment, many (most) of us are using VMware in some shape or form.
I have 5 x HP DL380G5 2 CPU servers each with 6GB in a rack running ESX 3.5, with a smaller server for the Virtual Center software. Each ESX host can support 7 virtual machines - DC, Rogger, AW/HDS, PG, CVP7, CUCM and CUPS. You do need a lot of disc space though - especially CUPS (80GB) and CUCM (40GB). And you need a lot of extra space for snapshots.