It depends what Linux version(s) you are talking about, but PlateSpin PowerConvert can do P2V of some Linux:
Redhat Linux (7.3, 8.0) ** Redhat Enterprise Linux (AS/ES 3.0, 4.0) ** SUSE Linux Enterprise (8.0, 9.0, 10) **
Don Pomeroy
VMware Communities User Moderator