The OpenSolaris Information Resources wiki well deserves a shout-out. Three major sections at the top link to information for three different audiences: users, system administrators, and developers. You can then drill down and access a valuable pool of referencestips and tricks, tutorials, task lists, forums. Remember that the site is a wiki, hence open to contributions. Just follow the simple steps on the How to Contribute page. To the folks behind the scenes, splendid job!