RANCHO PALOS VERDES, Calif. -- They aren't scheduled to be on stage together, but Steve Jobs and Steve Ballmer are both appearing this week at the D8: All Things Digital conference, organized by the Wall Street Journal's Walt Mossberg and Kara Swisher.

I'll be blogging from the event starting with the Jobs appearance at 6 p.m. today. As if Jobs wasn't interesting enough, the session also includes News Corp. Chief Executive Rupert Murdoch.

Jobs could shake it up by demonstrating the upcoming version of the iPhone. I'll also keep an eye on barstools at the Terranea Resort just in case.

Microsoft's show begins Wednesday morning when Mossberg and Swisher will demonstrate the Project Natal controller that's coming to the Xbox this holiday season. It's a relatively public appearance for the motion/voice controller, which Microsoft's been showing behind closed doors for more than a year and will formally launch on June 13 and 14 at the E3 game conference up the road in Los Angeles.

The Natal demo follows appearances by Comcast President Steve Burke, DreamWorks CEO Jeffrey Katzenberg and Dow Jones CEO Les Hinton.

Others appearing Wednesday include FCC Chairman Julius Genachowski, Facebook founder Mark Zuckerberg, Qualcomm CEO Paul Jacobs and movie director James Cameron.

Ballmer is highlighting a session Thursday with Ray Ozzie, Microsoft's chief software architect, before sessions with Microsoft allies, HTC Chief Executive Peter Chou and Ford CEO Alan Mulally.

Also appearing at the event are the chief executives of eBay, NPR and AOL (plus AOL co-founder Steve Case).

Tech companies doing formal demos at the event include Kno, a company making a tablet computer for students; Dell, which is apparently going to show its upcoming Streak tablets that I saw in Belltown recently; OnLive, a new on-demand game service; and Wordnik, an online dictionary.