The SmartOS ISO I downloaded, did not have an installer to help you install the OS to disk.
This one does, according to release notes.
Looks like they have tweaked some of the libraries and they provide both 32 and 64bit versions of Python also (this can be a pain to build sometimes as the configure tools don't always pull in the right libs, so you end up with mixed 32 and 64bit objects or other weirdness).
Also, the installer is minimal, basically just asks you what disk to install on. You do all other configuration after you have booted it for the first time.
