Solaris 10 06/06 (a.k.a Solaris 10 Update 2) should be available at the usual location today (or in the next really few days). You can alreay read the release notes at docs.sun.com. Biggest change: ZFS is available. But you will find other goodies like the kernel ssl proxy. Detlef already posted a step-by-step guide for the lifeupgrade to the new version (in german).
For user unaware of LiveUpgrade: With Lifeupgrade you can update a running operating system, activate new operating with one command and a boot, and fall back to the old version with one command and a boot. Try this with you prefered linux distribution ;)