Fortune

Motherhood and corporate leadership are no sweat for Marissa Mayer, who gave her first live interview as chief executive of Yahoo at Fortune’s Most Powerful Women event in Palo Alto last night.

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Time Inc. is going all-in when it comes to tablets, announcing Wednesday that by year-end, tablet editions will be available for all 21 of its U.S. publications.

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LinkedIn entered the news arena in March with its launch of LinkedIn Today, and Wednesday, it found a leader for its news efforts, naming Fortune digital editor Dan Roth executive editor.

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Fortune released an app tied to its 2011 Fortune 500 list, Fortune500+. Nothing unusual about that, right? Except that the app is HTML 5-based and designed for Internet browsers (PC or Mac), with tablet versions to be introduced down the road.

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Apple was admired even before Wednesday’s introduction of its iPad 2 tablet , as the company finished atop Fortune‘s list of the World’s 50 Most Admired Companies for the fourth consecutive year.

Other companies from the tech and media sectors that made the list were: Google (No. 2), Amazon.com (7), Microsoft (9), IBM (12), Disney (14), Cisco Systems (28), Intel (32), Samsung Electronics (38), Netflix (40), eBay (45), Sony (46), and Oracle (48).

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LinkedIn users can now view their network alongside Fortune‘s 100 Best Companies to Work for following the launch of a Company Insider widget by the professional networking site and the magazine.

The widget will display people in LinkedIn networks who work for the companies highlighted in the Fortune feature, as well as listing new hires and job changes, and allowing users to follow the companies.

Companies included on the list can display a Best Companies badge on their LinkedIn company pages, which will link to CNNMoney.com.

Netflix CEO Reed Hastings is a cover boy — specifically, the cover of Fortune, as he was named the magazine’s 2010 Business Person of the Year.

Other tech and media movers and shakers to crack the list of 50 included Apple CEO Steve Jobs (No. 3), Facebook CEO Mark Zuckerberg (No. 4), Baidu CEO Robin Li (No. 6), Oracle CEO Larry Ellison (No. 7), Amazon CEO Jeffrey Bezos (No. 10), Google CEO Eric Schmidt (No. 11), Zynga CEO Mark Pincus (No. 12), IBM CEO Sam Palmisano (No. 15), salesforce.com CEO Marc Benioff (No. 18), Andreessen Horowitz general partner Marc Andreessen (No. 19), Disney CEO Bob Iger (No. 22), Twitter CEO Dick Costolo (No. 24), Pandora founder Tim Westergren (No. 26), Time Warner CEO Jeffrey Bewkes (No. 27), DirecTV CEO Michael White (No. 32), Samsung Electronics CEO Geesung Choi (No. 39), Comcast CEO Brian Roberts (No. 43), and Mail.ru Group CEO Yuri Milner (No. 46).

Fortune reporter Peter Newcomb wrote on Hastings:

What does it take to be at the top of business in 2010? We searched for leaders who didn’t just crawl from the wreckage of the Great Recession, but sprinted from it. This year, Hastings has thrown his company’s muscle behind delivering television and movies over the Internet, risking his $2 billion-in-sales DVD-by-mail business. The result: a company that has grown from a gnat to a giant. Now when deals are made in media, the increasingly important question is, “What’s the Netflix piece?”

And Hastings told Fortune:

We are in a new race, and we are a player with some very large and substantial firms. Just to be in that league is an amazing place from where we were.

Fortune released its 2010 40 Under 40 rankings Thursday, and technology and media are well-represented, with Andreessen Horowitz co-founder and Netscape Communications founder Marc Andreessen occupying the top spot, followed by Facebook co-founder and CEO Mark Zuckerberg, and a third-place tie between Twitter co-founders Evan Williams and Biz Stone.

Google co-founders Sergey Brin and Larry Page tied for fifth; News Corp. chairman and CEO, Europe and Asia James Murdoch was No. 8; Univision Networks president César Conde No. 12; Aol chairman and CEO Tim Armstrong No. 18; there was a three-way tie at No. 27 between Facebook vice president of product Chris Cox, VP of engineering Mike Schroepfer, and chief technology officer Bret Taylor; foursquare co-founder and CEO Dennis Crowley was at No. 29; Slide founder Max Levchin and Vevo president and CEO Rio Caraeff tied at No. 31; Google head of location and mobile services Marissa Mayer at No. 34; Hulu CEO Jason Kilar at No. 37; and Microsoft global head of advertising Carolyn Everson at No. 39.

The 2010 40 Under 40 rankings will appear in the Nov. 1 issue of Fortune, which will be on newsstands Monday. The full list appears after the jump:

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David Kirkpatrick, author of The Facebook Effect: The Inside Story of the Company That is Connecting the World, has joined the staff of The Daily Beast, a two-year-old news site combining curated news, opinion and original reporting. Kirkpatrick, who is also the former senior editor for internet and technology of Fortune magazine, will serve as The Daily Beast’s Technology Columnist.

Said executive editor Edward Felsenthal about the new hire, “David has a long, extraordinary record as a reporter, author and convenor of the best minds in technology, we are thrilled to have him at The Daily Beast.”

Fortune will stream select sessions from its Fortune Most Powerful Women Summit for the first time ever.

The Fortune Most Powerful Women Summit will be held at the Mandarin Oriental Hotel in Washington, D.C., Oct. 4-6, and confirmed speakers include Secretary of State Hillary Rodham Clinton, Berkshire Hathaway chairman and CEO Warren Buffett, CNBC anchor Maria Bartiromo, Yahoo! CEO Carol Bartz, Demand Media chief revenue officer Joanne Bradford, former CNN and NBC anchor Campbell Brown, MSNBC Morning Joe co-host Mika Brzezinski, CNN chief political correspondent Candy Crowley, Fortune senior editor Nina Easton, Fortune assistant managing editor Leigh Gallagher, TIME executive editor Nancy Gibbs, Fortune senior writer Jessi Hempel, Blip.tv co-founder Dina Kaplan, Oxygen Media founder Geraldine Laybourne, Facebook vice president for global public policy Marne Levine, Fortune senior editor at large Carol Loomis, ImpreMedia CEO Monica Lozano, Fortune executive editor Stephanie Mehta, Paley Center for Media president and CEO Patricia Mitchell, Time Inc. chairman Ann Moore, TIME Washington correspondent Jay Newton-Small, CNBC Squawk Box co-anchor and Fortune guest columnist Becky Quick, Fortune senior editor Jennifer Reingold, Facebook chief operating officer Sheryl Sandberg, Fortune editor at large Pattie Sellers, NBC News chief medical editor Nancy Snyderman, Washington Post national political correspondent Karen Tumulty, Real Simple managing editor Kristin van Ogtrop, and Fox News Channel On the Record with Greta Van Susteren host Greta Van Susteren.