Hugo Rivero, senior staff engineer at Sun's ISV Engineering team, and I recently cowrote an article for Sun Developer Network: Working With Multiple Boot Environments on the OpenSolaris OS. The cool, behind-the-scenes utility is beadm, whose operations are illustrated with examples in the article.

And check out the OpenSolaris OS if you haven't done so yet. Besides the project site, you'll find many technical tips, guidance, and other tidbits on The Observatory, a most readable, illuminating group blog.