Virtually all of the work that we do in the illumos community is on x86 -- and not merely keeping it functional, but actively advancing the state of the art. For example, we at Joyent ported KVM to illumos last year[1], and since that time we have deployed many thousands of virtual (x86) machines into production on (x86) hardware running SmartOS, our illumos derivative.[2]
I keep a tab on those but I was more talking about real desktop/laptop/workstation class x86 hardware, not VM.
I have tried and given up running Solaris derivatives on bare metal even if for running just command line. The hardware /peripheral support just doesn't seem to be there.
[1] http://lwn.net/Articles/459754/
[2] http://smartos.org/