One of the little known/used enhancements from the upgrade to vSphere (and the accompanying VM Tools update) is the in-Windows perfmon DLLs. See image below--

<img src="http://img689.imageshack.us/img689/5145/vmperfmon.jpg" alt="" />

<!--more-->

In order to view these, simply launch Perfmon and add the Counters in. An issue/bug I've noticed is that you cannot simply right click and &quot;Add Counters&quot; and find the VM Proc/Mem items there-- you must go to properties, the Data tab, and add them in that way. Not sure if this applies for Server 2003, but that's how it works for me in Server 2008.

Keep in mind, if you've promised your developers let's say, 4GB of RAM, but then you went behind them and limited the VM to 2GB of RAM, they'll be able to tell with the perfmon tools (not that we'd ever do that to you, developers).