A huge group of people have pulled off the impossible. They have managed to release a developer preview of Open Solaris in October. 8:32PM PST 10/31 shall go down in history!
I immediately downloaded and ran the image in VMware Fusion 1.1RC1 on my 24" Santa Rosa iMac. Booted fast, and I was running. LIVE CD! Hooray! Ran the installer, enjoyed myself a trivial process, and waited ~20 min for it to finish.
Sadly, there is some weird weird bug that I've run into before that all the recent solaris builds, including Opensolaris exhibit - they hang/take forever to boot. Waited ~5 min and it finally started it's thing. Sure enough, it's got a nice bash shell, it's snappy, firefox works, the package system seems to have packages, and it's even running ZFS by default! I was even going to drop the output from "zfs list" here, but realized without VMware tools there's no easy way to copy/paste between opensolaris and OSX, and I'm not in the mood to type it all in, nor FTP/SCP it around. So trust me, or just run it yourself!
Took the mandatory screen shot too: