Joost and Joltid filed a motion for preliminary injunction against former Joost CEO Michelangelo Volpi and Index Ventures, where Volpi now works as a partner, asking that he not use knowledge or confidential information he got at the video start-up in current dealings with Skype.

The move is yet another legal attack from the founders of Skype, who were on the losing side of the $2 billion deal to buy the Internet telephony giant from eBay.

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According to numerous sources, Yahoo has been shopping around Zimbra, the open-source email company it bought in late 2007 for $350 million.

Zimbra is only one of the many assets of Yahoo that are now on the block, including its personals business, its HotJobs online classified unit and more to come.

The effort to unload Zimbra is yet another sign that the company is trying to slim down its diverse portfolio, even as it strives to redefine itself this week with a new, pricey marketing campaign that seeks to position Yahoo primarily as a consumer company.

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Revenge is a dish best served cold–except, of course, when one decides to serve it piping hot.

And that’s just what part of one of the losing sides of the $2 billion deal to buy Skype from eBay is doing in an unusual attack on Michelangelo Volpi, a well-known tech exec in Silicon Valley.

It’s Joost-y, for sure, so step right up to this sorry spectacle.

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Recently–in the echo chamber that is Silicon Valley–several people told BoomTown quite separately that former Yahoo President Sue Decker had become an executive-in-residence at the Blackstone Group.

Actually, when reached via email, Decker told me she has yet to decide her next step after leaving Yahoo and had simply set up a no-strings-attached desk at the private equity firm’s San Francisco office, but is definitely not an EIR there.

And who says bloggers don’t check?

In fact, a move to join Blackstone formally would have been very ironic for Decker given that the firm–specifically, longtime friend and former colleague, Jill Greenthal–was one of the advisers to Microsoft in its failed takeover battle for Yahoo.

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Since leaving Google several years ago, where he last worked on wireless spectrum issues, it’s hard to say exactly what role the digital jumping bean who is Chris Sacca plays.

He’s not an entrepreneur, although he seems to know all of them in Web 2.0 world and advises 18 start-ups. He’s no longer a big-company exec, although he was one and knows a lot of them too. He’s not a venture capitalist, although he is involved in a private equity firm and invests in a lot of the start-ups he advises, like the red-hot Twitter, and knows those guys too.

In any case, here’s my chat with the Silicon Valley gadfly, whom BoomTown has dubbed the Start-Up Whisperer.

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Back in the heyday, Peter Currie was the money man to see in Silicon Valley.

As CFO of Netscape Communications, he led the famed browser start-up into history, as the first great Internet rocket ship, when it went public on Aug. 9, 1995.

Rising to insane levels, the stock was ground zero of the Internet gold rush, despite the fact that it had no profits to speak of. But it did have a 23-year-old co-founder and tech wunderkind in Marc Andreessen and a growth trajectory that was astounding.

If you think it sounds somewhat similar to Facebook today–where Currie will now help out as temporary financial adviser after the social-networking site parted ways with its CFO, Gideon Yu, yesterday–you are correct.

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As reported Sunday night by BoomTown, former Yahoo exec and Quadrangle Group partner Dan Rosensweig will become CEO and president of the Guitar Hero division of gaming giant Activision Blizzard.

I chatted with both Rosensweig and Activision president and CEO Bobby Kotick yesterday about the move and where the gaming company is going in the year ahead.

“I love music and I love big brands,” said Rosensweig, whose enthusiasm for music, especially for Bruce Springsteen, is well known in the digital industry.

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Former Yahoo COO and current Quadrangle Group partner Dan Rosensweig will take over as CEO and president of Activision Blizzard’s powerful Guitar Hero franchise, according to sources close to the situation.

Rosensweig will run the hot gaming company’s division, located in Silicon Valley, for Activision head Bobby Kotick.

The pair know each other well, since Kotick served on Yahoo’s board for many years when Rosensweig was a key exec there. He’s also just the kind of consumer Web exec that Kotick has been looking for to turbocharge the largely retail Guitar Hero business online.

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