We virtualised more non-Windows physical servers last week - the more Unix/Linux hosts we virtualise, the more the strategy is reinforced; there is no straightforward process that works for every flavour of Linux/Unix currently supported by VMware as a Guest OS.
For example, a while back we P2V'd some Scientific Linux servers, and despite not being officially named on the 'Guest OS' guide, they are basically Red Hat - they even look like Red Hat, the servers run fine. How we P2Vd them, for one reason or another was not straight forward.