[THIN] Virtual Citrix servers

Hi all,
My boss would like to explore the idea of converting all our Citrix PS 4.5 (Windows 2003) servers to Virtual Servers (VMWare).

Now, I know VMWare is great, but I'm a little concerned about moving all the Citrix servers to VMWare.
I was wondering if anyone out there is already doing this.

I prefer the idea of moving some Citrix servers to VMWare, but not all.

Does anyone have see any problems with this besides the obvious hardware failures?

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Hector Minero
NSWCDD K55