Happy 1st Birthday OpenSolaris
One year on and still going strong. If you've got a spare partition or machine and are just the least bit curious about the best OS in the world, then download it and give it a go.
There's a great community, and discussion aliases full of Sun people, so if you have a problem or query, you're likely to get the answer from someone in the know. Now can you same the same thing about other operating systems?