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I have an impression that FreeBSD are being strongly supplanted by Linux in these days of virtualization. There were times where jails ruled the parties, but now these days are over and Linux has a number of great virtualization solutions like KVM or Xen while there is no much progress on jails.

Also, for some reason it's not very popular in enterprise despite of API and ABI stability, i.e. one could hardly find enterprise products like e.g. IBM WebSphere available on FreeBSD. One probably could use Linux ABI support but I'm not sure how reasonable that is.

I used to work at ISPs few years back and FreeBSD was very popular in this circles. At one place we had FreeBSD running on absolutely all servers and in other one we had only one RHEL box which was a requirement for some VoIP billing.

About two years ago I moved to a software development organization which is quite close to enterprise and virtualization and I've seen 'live' FreeBSD only once and the folks are going to migrate to Linux in the near future (I don't know what their reasons are though). And that's quite sad because I really like FreeBSD.