CEO blogs used to be all the rage within the business blogging community. Remember when we’d hear blog consultants gush about CEOs who dared to blog with transparency and authenticity. I rarely hear much talk about CEO bloggers anymore. Do you?

Remember Jonathan Schwartz? He was the poster child of blogging CEOs, the now former (as of February 3rd) CEO of Sun Microsystems. All you could hear was crickets on Jonathan’s blog from May of last year until finally Jonathan’s farewell post on January 27. Clearly he had a few things going on; Oracle was in the process of acquiring Sun. When you’re selling your company that is pretty much all that occupies your mind. I know that first-hand, as I’m happy to say my company (Netconcepts) was acquired by Covario last month.

The thing that most struck me was the name of Jonathan’s new blog. It’s titled “What I Couldn’t Say”. Hmmm. I guess transparency within a corporation only goes so far.

With the economy is in freefall, perhaps the tolerance of various boards of directors for CEO transparency has lessened? Or it could be simply that CEOs are just too busy and blogging isn’t such a priority, now that “blog” isn’t Word of the Year anymore.

Tony Hsieh, CEO of Zappos, is another CEO blogger who was acquired and who we don’t hear from any longer in the blogosphere. His last post was July of last year, and that wasn’t so much of a blog post as it was a copy of a letter that was sent to all the Zappos employees announcing the acquisition by Amazon. Before that, Tony last posted in January 2009.

I’m guilty too. My own “CEO blog” hasn’t seen any activity in over a month — no posts since Covario acquired us. But the reason for my ‘radio silence’ has nothing to do with the acquirer. I may no longer be a President/CEO, but I am still encouraged to keep blogging. The reason I don’t blog frequently is the same one as last year (when I was only posting a few times a month at best): I’m preoccupied running around speaking at conferences all over the U.S., writing for magazines, etc.

Then there are the corporate blogs where the CEO occasionally chimes in with his/her own post. My acquirer, Covario, fits into that group with its “Actionable Insights” blog. Trinity Road, an etailer of religious products like first communion dresses and rosaries, has a corporate blog, but you rarely if ever hear from the CEO on it.

Then there are the CEO blogs where you wonder if it’s actually the CEO who’s blogging because it’s so polished. Steve Spangler the science toys e-tailer, I think fits into that category. If you look at the posts on Steve’s blog you’ll see a gradual evolution to a style that is more and more polished.

Chris Baggott, CEO of the Compendium Blogware, has one of the best CEO blogs out there, in my opinion. It’s full of valuable content, it’s not overly polished, his personality really shines through, and he blogs regularly. It figures though. If any CEO would have that kind of a CEO blog, it would be the CEO of a business blogging software company!

Sun Microsystems CEO Jonathan Schwartz gave a great keynote interview at the Web 2.0 Expo last month. He was interviewed by Tim O’Reilly. The 30 minute-plus interview covered a wide range of fascinating business- and technology-related topics, not the least of which was business blogging. The first five minutes after the introduction concentrate specifically on how Schwartz — whom O’Reilly called “One of the most senior bloggers around” in terms of business leadership — uses his blog to reach both employees and potential clients.

Jonathan Schwartz accepts blogging wholeheartedly, but rejects the word itself. “‘Blogging’ will at some point be a little anachronistic. I communicate. My number one job as a leader of a company is to communicate. You used to communicate by being the celebrity CEO, you flew around and spoke with heads of state, and got local media to cover it, and got your message out in an inefficient and environmentally irresponsible way. Then the Internet came along and gave you access to the whole planet all at the same time. So why not use the Internet as a way to communicate directly and authentically to the marketplace? Then I will have satisfied at least one portion of my job.”

Blogging doesn’t just communicate with the marketplace, though. Sun’s CEO also uses his company blog to communicate with the more than 32,000 Sun employees. When they have questions about business decisions, Jonathan can respond to both the company and the marketplace via his blog. “If you are going to lead, you must communicate,” he said in the interview. “You can communicate in many different ways, through your actions, through your products. The way I communicate is by using the spoken and written word.”

Schwartz is a genuine blogger — he’s very much against having the PR people do any writing for him. But do they mind that they’re not in control of his message? “I don’t think I’ve ever terrified our PR department, but I’ve terrified our securities department once or twice, and they’ve been very quick about telling me to put in a safe harbor statement at the beginning of the post, and then they make an SEC filing based on what I just said, but now we’re very practiced about this and that’s no longer the norm. I can get away with a link to a safe harbor statement now.”

The CEO isn’t the only blogger at Sun — more than 4300 people at the company, from marketing and HR staffers to high-level engineers and managers have blogs on the Sun Microsystems corporate site. Some of them are in languages other than English, and many of them are fascinating not solely as an insight into the internals of one of information technology’s founding companies, but as a collection of smart people who love to share ideas about a wide range of subjects. “The most terrifying day for me as a blogger was when our general counsel started writing a blog,” Schwartz said jokingly. “Actually that’s not true — he’s very thoughtful. And guess who reads his blog? Other general counsels.”

The rest of the interview covers Sun’s MySQL purchase and the integration of two businesses into one, Sun’s open source strategy, cloud computing, how giving away products for free gives insight into the market and access to potential hardware and services customers, utility computing, the evolution of high-performance computing, the “black box” data center, efficiency and power consumption (”[electricity] is the number two expense, next to people”), and how blogging helps inform people about all of these issues.

Good stuff!

If you’re a CEO, you’d do well to emulate Jonathan’s approach to business blogging.