A number of cool things came out with the latest Solaris Express Developer Edition (1/08).
There is a new printing guide covering important new features in Solaris printing:
Support for Automatic Printer Discovery and Configuration in the GNOME Desktop Environment
Changed Privilege Requirements for Using Solaris Print Commands
PPD File Management Utility for administering PostScriptTM Printer Description (PPD) files that are used with the Solaris print subsystem
Microsoft interoperability: Solaris now supports the CIFS service and has a new guide devoted to interoperability with Microsoft.
A Solaris server can now be an active participant in a Windows active directory domain and provide ubiquitous, cross-protocol file sharing through CIFS and NFS to clients in their native dialect.
Solaris now includes Sun xVM Hypervisor, a new virtualization feature based on an open source project, Xen. See Part IV in the newly retitled System Administration Guide: Virtualization Using the Solaris Operating System
The Solaris Trusted Extensions Administrator's Procedures contains the following new procedures and examples:
Add Trusted Extensions labels to a Solaris system by enabling the labeld service, then rebooting.
Add a ZFS dataset to a labeled zone.
Every labeled zone can have its own nscd daemon.
NFSv3 recognizes multilevel mounts.
The Domain of Interpretation (DOI) is configurable.
In this task, there's an example: Creating a Security Template With a Different DOI Value
BigAdmin has a host of new articles, many submitted by the community of Solaris system administrators. These articles augment Sun's customer documentation or covers topics that aren't covered in quite this way in the documentation. All are worth reading.
Guidelines for Using Solaris Live Upgrade With Solaris Zones
Volume Management Within Solaris Zones
Impact of Swap Space on System Performance for the Solaris 9 and 10 OS
Tweak to XPerts transcript on Patching
Script for Checking Used Space in File Systems in the Solaris OS
Updates: Scripts for Automating System Checks
From another source, here are three tutorials on Solaris security features: