I'm testing Nexenta in an effort to make Fuse for Solaris and my perl bindings play nice.

root@solaris:~# uname -a
SunOS solaris 5.11 NexentaOS_20070402 i86pc i386 i86pc Solaris

Checkout source:

hg clone ssh://anon@hg.opensolaris.org/hg/fuse/fusefs