Our IT group wants to start the rollout of MOSS using 2 servers. One DB,
one Front-end/index server. The front end server will be split into VM
instances.

I'd rather not do this, as MS pretty clearly states that they recommend
a minimum 4-machine farm, but it's what I have to work with.

So, just curious as to whether or not anyone else has had to run SP on a
VM 'farm' like this and if there are any major gotchas to worry about.

We'll start with:

1 front end server, 2 VMs. 1 VM appserver, 1 VM appserver + indexing
server
1 back end DB server

And I imagine we'll eventually want to/need to grow into:

2 front end appservers
1 index server
1 db server (possibly clustered)

Is there anything I should do now with the VM install to make migration
to the separate servers down the road less painful?