I wasn't talking about shipping a kernel comprising Linux and ZFS. I was talking about
Nexenta -- http://nexenta.org -- a project to compile Ubuntu packages on Solaris so that you
can use all the familiar userland tools such as apt-get and also the beautiful new Solaris
tools such as ZFS and dtrace.
For example, the nexenta folks have created a tool called "apt-clone", which uses ZFS
snapshots to make it possible to rewind to that particular set of installed debian packages.
Isn't that awesome?