The OpenSolaris Project is alive. Ashlee Vance provides the most intelligent summary of the project that I've read. Something cool you can do immediately is browse the source using a Web front-end to CVS. This is really useful if you want to understand how the OS is assembled. A common criticism of this release is the lack of a downloadable .iso or similar distribution. You must start with Solaris Express: Community Release, Build 16 or newer, then follow the release notes. This is not as user-friendly as the new Fedora Core 4 release announced today. (Note on the announcement -- those Fedora/Red Hat people are so witty!)
I plan to try each once I get some free time.